Tour de France 2026

Tour de France 2026 Weather: Stage-by-Stage Spectator Tool

The 113th Tour ran 4–26 July 2026 from Barcelona to Paris (3,320.7 km). This guide keeps the stage-by-stage weather profiles, the Spectator Score and live stage-town forecasts as a reference for July cycling trips and future Tours.

Spectator Decision Card

Adjust the forecast for your stage day — the score recalculates instantly.

27°C
12km/h
20%
25%
7

Spectator Score

76/100
Great

Storm risk is the limiting factor: afternoon convection possible — plan exit before 16:00.

How this score was calculated

Starting score
100
Air temperature (27°C)
-8
Wind (12 km/h)
±0
Rain probability (20%)
±0
Storm risk (25%)
-12
UV index (7.0)
-4
Final Spectator Score
76

Signature feature

The Stage Weather Matrix

Stage altitude × weather scenario, scored at a glance. A unique 2D matrix that turns 'what should I expect on Alpe d'Huez?' into one cell.

Weather scenario →
Cool front
18°C base
Classic July
26°C base
Hot day
32°C base
Stormy
24°C + cells
Heatwave
37°C
Stage altitude ↑
Valley town
< 400 m
78
96
60
46
58
Hilly stage
400–900 m
64
91
70
35
72
Mid-mountain
900–1500 m
49
73
73
35
57
High summit
1500 m+
35
48
73
21
65
🚴 90+ Perfect🥳 80+ Festival day😎 70+ Great🙂 55+ Decent😬 40+ Tough🥶 <40 Stay home

Altitude rows project the valley temperature using the −6.5°C / 1000 m lapse rate, with extra wind and storm risk above 1000 m.

Rankings

Best Spectator Stages, 2026 Tour

Composite ranking across baseline weather, sporting drama, scenery and historical crowd density — the six 2026 stages that stood out for spectators.

Optimize for
🥇

Stage 21 · Thoiry → Paris (Champs-Élysées)

Hilly / punchy

⭐ Montmartre climb + Champs-Élysées finale

Weather84
Drama90
Scenery96
Crowds99
91
Overall
★★★★★
🥈

Stage 1 · Barcelona → Barcelona

Team TT

⭐ Grand Départ TTT — Montjuïc finale

Weather82
Drama82
Scenery92
Crowds97
87
Overall
★★★★★
🥉

Stage 16 · Évian-les-Bains → Thonon-les-Bains

Individual TT

⭐ Lone ITT along Lake Geneva

Weather84
Drama84
Scenery90
Crowds85
85
Overall
★★★★★
#4

Stage 10 · Aurillac → Le Lioran

Mountain

⭐ Bastille Day on the Puy Mary

Weather73
Drama88
Scenery84
Crowds88
82
Overall
★★★★★
#5

Stage 20 · Le Bourg-d'Oisans → Alpe d'Huez

Mountain

⭐ Col du Galibier + Alpe d'Huez double

Weather50
Drama99
Scenery98
Crowds99
82
Overall
★★★★★
#6

Stage 19 · Gap → Alpe d'Huez

Mountain

⭐ Alpe d'Huez — 21 hairpins (first ascent)

Weather50
Drama98
Scenery96
Crowds98
81
Overall
★★★★★

Overall = 35% weather (Spectator Score) + 25% sporting drama + 20% scenery + 20% historical crowd density. Crowd density is an editorial estimate from past TV coverage, finish-line capacity and iconic-finale frequency — not a live attendance number.

Trip planner

Plan My Tour

Pick how many days you have and what you actually like — we'll pull the matching stages from the 2026 race book as a template for future trips.

Day 1
21

Thoiry → Paris (Champs-Élysées)

2026-07-26 · Hilly / punchy · Montmartre climb + Champs-Élysées finale

91
Match
Day 2
1

Barcelona → Barcelona

2026-07-04 · Team TT · Grand Départ TTT — Montjuïc finale

87
Match
Day 3
16

Évian-les-Bains → Thonon-les-Bains

2026-07-21 · Individual TT · Lone ITT along Lake Geneva

85
Match

Match score = climatological weather (Spectator Score) + sporting drama + scenery + crowd density, adjusted by your selected days, terrain, kids, heat tolerance and budget. Reasons pills explain each bonus. Not a booking system — a starting shortlist.

Risk map

The Most Dangerous Weather Stages

Five categories of weather risk on the 2026 route — the stage that carried each one, plus what to do about it.

Highest storm risk

Stage 6 · Pyrenees

Pau → Gavarnie-Gèdre

50% afternoon convection

Exposed Pyrenees terrain with afternoon convection — plan an exit before 16:00 and stay off summit roads if cells fire.

Highest heat exposure

Stage 7 · Nouvelle-Aquitaine

Hagetmau → Bordeaux

30°C base · UV 9

Heat-blasted Nouvelle-Aquitaine day. Hydrate aggressively, find shade by midday and skip the open tarmac stretches.

Strongest winds

Stage 6 · Pyrenees

Pau → Gavarnie-Gèdre

22 km/h sustained

Exposed cols above 2100 m amplify wind 2–3×. Echelons likely; descents are sketchy.

Coldest summit

Stage 20 · Alps

Le Bourg-d'Oisans → Alpe d'Huez

~9°C on the summit

Top of Col du Galibier + Alpe d'Huez double sits at 2642 m — pack a fleece and a windproof shell even on a hot valley day.

Longest roadside exposure

Stage 20 · Alps

Le Bourg-d'Oisans → Alpe d'Huez

~9 h on the roadside

Iconic but brutal: arrive by 09:00, hold the spot until late afternoon. SPF50, 3 L water, hat — non-negotiable.

Head to head

Compare Two Stages

Side-by-side spectator comparison — Alpe d'Huez vs the Champs-Élysées by default, swap in any stage.

50
Tough
vs
84
Great
Winner
FactorStage 19Stage 21
TypeMountainHilly / punchy
Distance128 km130 km
Max altitude1860 m130 m
Base air temp23°C26°C
Summit temp (lapse)16°C26°C
Wind18 km/h14 km/h
Rain probability30%25%
Storm risk45%25%
UV index107
Roadside exposure8 h4 h
Drama9890
Scenery9696
Crowds9899

Green = the better value for a spectator (lower wind/rain/UV, higher drama/scenery/crowds). Spectator Score uses the same engine as the Decision Card.

Quick verdicts

Should I actually do this today?

Eight common Tour-spectator questions, answered live against the conditions you set in the Decision Card above.

Roadside spectating?

Go

Solid conditions overall for a roadside day.

Mountain stage (Alpe d'Huez)?

Go

Stable, dry, mild — classic mountain-stage viewing weather.

Bring family / kids?

Go

Comfortable temperature and stable sky — great for a family roadside day.

Pack a waterproof?

Don't

Dry day expected — leave the rain shell in the car.

Drive to the stage town?

Go

Clear roads — standard 6 AM departure for popular climbs.

Cycle up before road closure?

Go

Cool, calm, dry — perfect to ride up early before road closure.

Wait for the publicity caravan?

Go

Clear roads — standard 6 AM departure for popular climbs.

Bring binoculars / camera?

Go

Solid conditions overall for a roadside day.

Interactive

Today's Packing List

A roadside packing list that updates with the Decision Card — essentials checked, optional items flagged.

Live packing list — updates with the Decision Card above.

7 essentials
  • 2–3 L water per person

    6+ hours roadside — dehydration is the most common medical call.

  • Snacks & sandwiches

    Roads close hours before the bunch — no shops near the climbs.

  • Phone power bank

    No signal in valleys — track the race & coordinate with friends.

  • Cash or a payment card

    Most French cafés take cards, but caravan vendors and rural stalls are often cash-only — carry small euro notes as backup.

  • SPF 50+ sunscreen

    UV index 7.0 — burn risk in under 30 min on a south-facing slope.

  • Wide-brim hat

    Shade follows you when there's no tree cover.

  • Sunglasses (Cat 3+)

    High UV plus white-rock glare on alpine roads.

  • Foldable camping stool

    Standing for 6h on tarmac wrecks knees.

  • Binoculars or zoom camera

    The bunch is gone in 30 seconds — get the shot.

Live now

Live Spectator Score: 8 Tour Stage Towns

Today's live air temperature, wind, rain probability and UV from Open-Meteo for major 2026 stage towns — scored through the same engine as the Decision Card.

Barcelona

Grand Départ · Stages 1–2

Pau

Pyrenees gateway · Stages 5–6

Bordeaux

Heat-exposed flat · Stage 7

Belfort

Vosges foothills · Stage 13

Évian-les-Bains

Alps ITT · Stage 16

Bourg-d'Oisans

Alpe d'Huez base · Stages 19–20

Briançon

Southern Alps hub

Paris

Champs-Élysées · Stage 21

Storm risk is estimated from rain probability and amplified for mountainous towns (Bourg-d'Oisans, Briançon). Live air, wind, rain and UV data from Open-Meteo.

Visual guide

Mountain Temperature & the UCI Protocol

Two infographics that turn altitude lapse rates and stage neutralisation triggers into a glance.

Altitude vs Temperature on a Classic July Stage

Why a 28°C valley start can mean 16°C at Alpe d'Huez and 13°C on a Tourmalet-class col.

Valley · 200 m

28°C

Base reference for a classic July stage start in southern France.

Hilly · 700 m

~23°C

Roadside on Massif Central or Pre-Alps foothills.

Pass · 1500 m

~18°C

Plateau de Solaison-type summit finish. Bring a fleece.

Alpe d'Huez · 1860 m

~16°C

Classic Alpe d'Huez summit. 12°C swing from the Bourg-d'Oisans valley.

Col · 2500 m

~13°C

Tourmalet / Galibier territory. Hail and snow possible in July.

UCI Extreme Weather Protocol Triggers

Conditions that can shorten, neutralise or move a Tour stage.

38°C+

Heat trigger

Extra feed zones, later start times, on-bike cooling.

Thunder in zone

Storm trigger

Sections neutralised, finish potentially moved or stage shortened.

Snow > 1500 m

Snow trigger

High-pass climbs rerouted or cut from the stage.

Wind > 60 km/h

Wind trigger

Exposed descents and bridges neutralised for safety.

< 5°C + rain

Cold trigger

Descent neutralisation discussed (e.g. 2021 Mont du Chat).

The 2026 route

The 2026 Route in 60 Seconds

The route as raced: 3,320.7 km over 21 stages, ending with an Alps-dominated final week and two summit finishes at Alpe d'Huez.

  • Week 1 (4–12 July): Barcelona Grand Départ → Pyrenees → flat across southwest France to the Massif Central.
  • Rest day 1 (13 July): Cantal — the day before Bastille Day.
  • Week 2 (14–19 July): Massif Central → Vosges mountains → Plateau de Solaison summit finish.
  • Rest day 2 (20 July): Haute-Savoie — riders recovered in the lakeside Alps for the final Alpine assault.
  • Week 3 (21–26 July): Alps — Évian individual TT, Orcières-Merlette, double Alpe d'Huez, Paris finale.
Peloton on a Tour de France mountain stage in summer sun

Climate zones

Five Weather Zones Across One Race

French and Spanish summer weather in July is dominated by the Azores High, but the Tour route crosses three very different climate zones — and the contrast produces most of the drama.

Catalonia & Mediterranean Spain (Stages 1–3)

Barcelona in early July averages 28°C daytime, 21°C overnight, sea-temperature 23°C, around 1 rainy day per fortnight. The Mediterranean climate is the hottest and driest of the route. UV index hits 9–10 daily.

Atlantic Southwest France (Stages 5–9)

Pau, Bordeaux, Bergerac and Périgueux sit in the Atlantic-influenced southwest. Typical July: 28°C daytime, 16°C overnight, 7–9 rainy days per month. Bordeaux has a documented history of late-July heatwaves (38°C+).

High Pyrenees (Stages 3, 5, 6)

Climatologically wetter than the Alps and famous for sudden afternoon thunderstorms. Above 2,000 m: 10–14°C daytime, 3–7°C overnight, 30–40% afternoon storm probability.

Massif Central, Burgundy & Vosges (Stages 10–14)

The Massif Central plateau sits at 700–1,400 m altitude — cooler than the surrounding lowlands by 4–6°C. Stage 10 climbs through volcanic Auvergne on Bastille Day.

Northern Alps & Haute-Savoie (Stages 15–20)

The wildest weather of the race. Valley starts at 25–30°C, summit finishes at 8–14°C, snow possible above 2,500 m even in July. Afternoon convective thunderstorms common at altitude.

Paris Île-de-France (Stage 21)

Late July averages 26°C daytime, 16°C overnight, 25% afternoon rain probability, sunset 21:35 CEST. Heatwaves do happen (40°C+ in 2019, 2022).

Stage-by-stage

All 21 Stages: Dates, Routes & Weather Risk

The official 2026 route stage-by-stage with the climatological weather profile of each finish town.

Week 1: Spain & Pyrenees (4–12 July)

Stage 1 · Sat 4 July
Barcelona — 19.6 km team time trial
Hot & humid (28–32°C, light sea breeze)
Stage 2 · Sun 5 July
Tarragona → Barcelona · 178 km hilly
28–31°C, Montjuïc finish
Stage 3 · Mon 6 July
Granollers → Les Angles · 196 km mountain
First Pyrenees, 12–18°C summit, storm risk
Stage 4 · Tue 7 July
Carcassonne → Foix · 182 km hilly
26–30°C, mistral wind possible
Stage 5 · Wed 8 July
Lannemezan → Pau · 158 km flat
Hot Atlantic valley, 28–32°C
Stage 6 · Thu 9 July
Pau → Gavarnie-Gèdre · 186 km queen mountain
Major storm risk, 10–14°C summit
Stage 7 · Fri 10 July
Hagetmau → Bordeaux · 175 km flat
Most heat-exposed flat stage, 30–36°C possible
Stage 8 · Sat 11 July
Périgueux → Bergerac · 182 km flat
28–32°C, Dordogne valley
Stage 9 · Sun 12 July
Malemort → Ussel · 185 km hilly
Massif Central foothills, 24–28°C
Mon 13 July
Rest day · Cantal
Cool plateau, 22–25°C · Bastille Day eve

Week 2: Massif Central, Burgundy & Vosges (14–19 July)

Stage 10 · Tue 14 July
Aurillac → Le Lioran · 167 km mountain (Bastille Day)
Volcanic Auvergne, 18–24°C
Stage 11 · Wed 15 July
Vichy → Nevers · 161 km flat
Loire valley, 26–30°C
Stage 12 · Thu 16 July
Magny-Cours → Chalon-sur-Saône · 181 km flat
Burgundy, 27–31°C
Stage 13 · Fri 17 July
Dole → Belfort · 205 km hilly
Jura foothills, 25–29°C
Stage 14 · Sat 18 July
Mulhouse → Le Markstein · 155 km mountain
Vosges, late storm risk
Stage 15 · Sun 19 July
Champagnole → Plateau de Solaison · 184 km mountain
First-ever Plateau de Solaison summit finish
Mon 20 July
Rest day · Haute-Savoie
Lakeside Alps, 23–27°C

Week 3: Northern Alps & Paris (21–26 July)

Stage 16 · Tue 21 July
Évian-les-Bains → Thonon-les-Bains · 26 km ITT
Only ITT of the race, Lake Geneva shore
Stage 17 · Wed 22 July
Chambéry → Voiron · 175 km flat
Pre-Alps valley, 27–31°C
Stage 18 · Thu 23 July
Voiron → Orcières-Merlette · 185 km mountain
Southern Alps summit, 12–17°C top
Stage 19 · Fri 24 July
Gap → Alpe d'Huez · 128 km mountain
First Alpe d'Huez, 13.8 km @ 7.9%
Stage 20 · Sat 25 July
Le Bourg-d'Oisans → Alpe d'Huez · 171 km mountain
Second Alpe d'Huez in 24 hours · Decisive stage
Stage 21 · Sun 26 July
Thoiry → Paris (Champs-Élysées) · 130 km flat
Traditional finale, late afternoon sprint

Headline weekend

The Alpe d'Huez Double-Header (24–25 July)

Two consecutive summit finishes on the same 13.8 km, 7.9% climb — an exceptionally rare arrangement in modern Tour history.

Stages 19 and 20 both finish at the summit of Alpe d'Huez. For spectators, this was the headline weekend of the 2026 Tour.

Weather profile: Bourg-d'Oisans (valley, 720 m) sits at 28°C in mid-afternoon July; the summit at 1,860 m typically reads 18°C. Afternoon thunderstorms hit roughly 1 in 3 July days. Spectators should pre-position on the climb early morning, accept that the road closes for 8+ hours, and pack for both 30°C valley sun and 10°C summit chill. The famous Dutch Corner (turn 7) is the loudest, sweatiest party on the mountain.

Cyclists climbing the hairpin switchbacks of Alpe d'Huez on a bright summer day

The finale

The Champs-Élysées Finale (Sunday 26 July)

Stage 21 is 130 km of mostly-flat racing into a redesigned Paris finale that again climbs the Côte de la Butte Montmartre before the Champs-Élysées run-in.

Champs-Élysées in Paris with the Arc de Triomphe in golden evening light

The modified finale replaces the traditional flat bunch-sprint with a much more selective finish that drew huge crowds and high TV viewership last year. The Montmartre climb is 1.1 km cobbled at 5.9%, cresting 6.1 km from the line.

Weather: Paris on 26 July averages 26°C high, 16°C low, 25% afternoon rain probability, sunset at 21:35 CEST. The bunch sprint or final breakaway typically lands between 19:00 and 19:30 CEST. Most years deliver warm dry evening light; occasional thundery breakdowns produce dramatic finishes.

Check the live forecast for Paris →

Planning horizons

How to Use Forecasts for Tour Trip Planning

Tour planning happens on different time horizons. Match the forecast type to the decision you're making.

  1. 6+ months ahead: Use climatological averages (this article). Pick stage type — flat / sprint / mountain. Book hotel in finish town.
  2. 10 days ahead: First reliable signal of unsettled vs settled spell. Decide between alternative stages if flexible.
  3. 5 days ahead: Daily 7-day forecast becomes reliable. Lock in packing weight — rain-jacket day or sun-block day.
  4. Day before: Hourly precision. Check radar trends if mountain stage. Decide morning departure time.
  5. Stage morning: Check hourly radar at 7 AM and again at 11 AM. Mountain storms develop 14:00–17:00 — race usually finishes earlier.

Everything else

Tour de France 2026 Weather FAQ

Twenty-five answers covering dates, climate, spectator planning, safety protocols and the Spectator Score.

Route & dates

When is the Tour de France 2026?
The Tour de France 2026 ran from Saturday 4 July to Sunday 26 July 2026 — 23 days, 21 race stages and 2 rest days. The 113th edition covered 3,320.7 km (about 3,321 km). The Grand Départ was in Barcelona, Spain (the third Spanish start in Tour history), and the race finished in Paris on Stage 21, with the finale climbing the Côte de la Butte Montmartre before the run-in to the Champs-Élysées.
Why did the Tour de France 2026 start in Barcelona?
Barcelona was awarded the 2026 Grand Départ by race organisers ASO in February 2025. Stages 1 and 2 both finished on Montjuïc hill next to the Estadi Olímpic Lluís Companys (1992 Olympics). Stage 1 was a 19.6 km team time trial in Barcelona — a rare format for a Grand Départ.
When did the Tour de France 2026 finish in Paris?
The 2026 Tour finished on Sunday 26 July with Stage 21 from Thoiry to the Champs-Élysées in Paris (130 km). The final stage traditionally rolls into central Paris in mid-afternoon and finishes in the early evening.
Was the Tour de France 2026 affected by Tour Femmes?
No — the Tour de France Femmes 2026 started on 1 August (after the men's race ended 26 July). However Mont Ventoux is on the Tour Femmes 2026 route, not the men's. The two races now run back-to-back through the same calendar window.
When does each Tour de France stage finish?
Stages typically start between 11:00 and 13:30 CEST and finish between 16:30 and 17:30 CEST. Mountain stages can run until 18:00. Plan to be in your roadside spot at least 3 hours before estimated arrival, especially on Alpe d'Huez and any final mountain pass where road closures begin 6–8 hours before the race.

Weather & climate

What is the weather like during the Tour de France?
July is the hottest, driest month for most of mainland France and northeast Spain. Expect 25–32°C on flat and hilly stages, 30°C+ heatwaves possible on flat days in the south, and dramatically cooler conditions in the Pyrenees and Alps — 8–15°C at high passes with afternoon thunderstorms a near-daily risk above 2,000 m.
How much rain is typical during the Tour de France?
Climatologically, French summer is dominated by stable high pressure with intermittent thundery breakdowns. The flat stages in the southwest and around Bordeaux/Bergerac average 7–9 wet days in July. In the high mountains afternoon convective storms occur on 30–40% of July afternoons — race timing usually finishes before peak storm hours, but not always.
How hot does it get on Tour de France mountain stages?
Mountain stages are the most thermally variable. The valley start can be 32°C in Pau, Lannemezan or Bourg-d'Oisans, while the summit at Alpe d'Huez (1,860 m) is typically 10–14°C cooler. Add wind chill on long descents at 80 km/h and riders descend in temperatures effectively below 10°C — a 25°C swing inside one stage.
What is the weather like on Alpe d'Huez?
Alpe d'Huez (1,860 m) in July averages 19°C daytime high and 9°C overnight low, with thunderstorms common on summer afternoons. In 2026, Stage 19 (24 July) and Stage 20 (25 July) both finished on Alpe d'Huez — two consecutive summit finishes on the legendary climb. Spectators should pack for sun, sudden rain, and post-sunset temperatures below 10°C.
What is the weather like in Paris for the Champs-Élysées finish?
Late July in Paris averages 26°C daytime high and 16°C overnight low. Rain risk is moderate (~25%) and afternoon thunderstorms are possible. Sunset on 26 July is around 21:40 CEST, so the final laps unfold in daylight.
Which Tour de France stages are most weather-sensitive?
In the 2026 route, Stage 3 (first Pyrenees), Stage 6 (Pau → Gavarnie-Gèdre queen stage), Stage 14 (Vosges), Stage 15 (Plateau de Solaison summit), Stage 18 (Orcières-Merlette), and the double Alpe d'Huez weekend (Stages 19–20) were the most exposed. Storms, snow, or extreme heat have neutralised stages in past editions.

Spectator planning

What should I wear to watch the Tour de France roadside?
Layer for variability. Bring sun hat, SPF 50, refillable water (2 L), packable waterproof, light jumper, and sturdy walking shoes — most viewing spots involve a 1–3 hour walk and 4–6 hours waiting roadside. For mountain stages, add a fleece and windproof for after the riders pass and temperatures drop fast.
How early do I need to arrive at a mountain stage?
For famous climbs like Alpe d'Huez, Tourmalet, or Plateau de Solaison, road closures begin 6–8 hours before race arrival. Plan to be in position by 09:00 for a 16:30 finish, ideally earlier if you want a prime corner spot.
Can I drive to a mountain stage on race day?
Only if you arrive before the road closure window opens — typically 6–8 hours before race arrival. Many spectators park in the valley town the night before and walk or shuttle up early in the morning.
Is the publicity caravan worth waiting for?
Yes — the 200-vehicle caravan passes 1–2 hours before the riders and throws free hats, keyrings, sweets and samples to the crowd. It's the loudest, most family-friendly part of a Tour day.
Can I cycle up the Alpe d'Huez before the stage?
Yes — many spectators ride up the climb in the morning before the road officially closes. Bring water, lights and a windproof shell. You'll need to be off the road and in position by mid-morning.
Where can I check live weather for Tour de France towns?
Use a forecast that updates hourly and shows precipitation radar. Snap Weather has live forecasts for the 2026 Grand Départ city (Barcelona) plus key stage towns like Pau, Bordeaux, Bourg-d'Oisans and Paris — linked in the Live Stage Towns grid above.

Safety & race protocols

Can the Tour de France be cancelled for weather?
Individual stages can be shortened, neutralised, or rerouted — but rarely cancelled outright. In 2019, a hailstorm and mudslide on the Col d'Iseran neutralised Stage 19. In 2024, extreme heat triggered the UCI Extreme Weather Protocol with later starts. The race itself has not been cancelled mid-event since World War II.
What is the UCI Extreme Weather Protocol?
The UCI Extreme Weather Protocol allows race direction, the chief medical officer, and a riders' representative to delay a start, shorten a stage, or neutralise sections when conditions threaten rider safety. Triggers include: thunderstorms in the race zone, sustained 38°C+ heat, snow on summits above 1,500 m, dangerous crosswinds on exposed sections.
When does the UCI consider it too hot to race?
There is no single hard threshold, but sustained 38°C+ heat triggers extra feed zones, ice socks, on-bike cooling and start-time changes. Above 40°C with high humidity, stages have been started earlier or shortened.
What happens if there's a storm during the race?
Race direction can neutralise dangerous descents, move the finish to a lower point on a climb, or shorten the stage. Spectators on exposed climbs should leave at the first sign of an approaching cell — open ridges and metal barriers are dangerous in lightning.

How our Spectator Score works

What is the Spectator Score?
A 0–100 score combining air temperature, wind, rain probability, storm risk and UV index. 85+ is perfect roadside weather. Under 35 is "stay home". Computed by the same pure function that powers the Decision Card, the Stage Weather Matrix and the 8 Live Stage Towns above.
How is the Spectator Score calculated?
Score starts at 100 and applies capped penalties per factor. No single factor sinks the score on its own — except storm risk above 70%, which acts as an absolute "stay home" trigger. Full breakdown is visible in the Decision Card.
Why does the score drop on mountain stages?
Mountain stage rows in the matrix project a −6.5°C / 1000 m lapse rate, add 5–15 km/h of altitude wind, and bump storm risk by 10 points above 1000 m. That's why a "Classic July" valley stage scores 85 but the same day at Alpe d'Huez scores in the 70s.
Is the Spectator Score accurate for my exact roadside spot?
The score uses the closest Open-Meteo grid cell and a published lapse rate. Real microclimate (which side of the col you sit on, tree cover, asphalt vs grass) can shift the felt temperature by 3–5°C. Use the score as a strong directional signal, not absolute truth.

Transparency

Methodology & Editorial Standards

Methodology & Editorial Standards

Full transparency on how every score, threshold and recommendation on this page is produced.

How the Spectator Score is calculated

A pure function starts at 100 and applies capped penalties for each spectator-relevant input — air temperature, wind, rain probability, thunderstorm risk and peak UV — at the roadside altitude you're watching from. Penalties are capped so no single factor sinks the score on its own, except severe weather codes (active thunderstorms, gale-force wind, extreme heat) that act as absolute 'stay home' blocks.

Data sources

Live weather is fetched from Open-Meteo (current + daily + hourly) for every stage town. Mountain summit temperatures are projected from valley readings using the −6.5°C / 1000 m environmental lapse rate, with extra wind and convective storm risk applied above 1000 m. Stage routes and altitudes follow the official ASO 2026 race book.

Limitations

Mountain microclimates above 1500 m can diverge sharply from valley forecasts — treat the score as directional, not absolute. Storm timing on Alpine stages is notoriously hard to nail beyond 48 hours. The UCI Extreme Weather Protocol decision sits with the race jury on the day and is not modelled here.

Last reviewed

This guide was last reviewed on October 11, 2026. Scoring thresholds are reviewed quarterly.

Editorial standards

Recommendations are written to help readers make a real decision, not to optimise for keywords. No generic filler, no AI boilerplate. Every threshold is traceable to a public meteorological reference or a documented internal heuristic.

Safety policy

The score does not read official warnings or live lightning data. Large thunderstorm, wind and heat penalties pull it down sharply; always follow official warnings and race-organiser instructions on the day — when thunder roars, go indoors.