August brings 23°C daytime highs, 92mm of precipitation across about 10 wet days and 13.9 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is July to September. December is the quietest month: low-key and inexpensive, and still good for cabin weekends, festive season and low-angle light.
Long-run climate normals for Chamonix. Month ratings compare months within Chamonix only — they are not a ranking of Chamonix against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | August — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | July–September |
| Quietest month | December — fewest visitors |
| Driest month | February — 65mm |
| Wettest month | June — 102mm |
| Warmest / coolest | July 23°C / February 2°C |
| Seasonality | Strongly seasonal — the months feel like different places |
| Annual rainfall | 1250mm over roughly 110 rain days |
Chamonix swings 21°C between July (23°C) and February (2°C) — the month you pick changes what you pack more than where you go.
June gives you 15.5 hours of daylight against just 8.5 in December — a 7-hour difference in how much you can actually fit into a day.
February is the driest month at 65mm across roughly 7 wet days, while June peaks at 102mm.
January–February sit at or below freezing, so the precipitation shown for those months falls mainly as snow rather than rain — the millimetre figures are water equivalent, not puddles.
July is almost as good as August, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Chamonix changes character completely through the year — August and December are effectively two different destinations. Pick the month that matches what you want to do, not the highest-rated one.
Ratings compare months within Chamonix, not against destinations worldwide: five stars means the best time to be here, not that Chamonix beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 2°C / -5°C | 82mm (snow) | 9 | 5h | 8.8h | Snow · Skiing · Cabin weekends |
| February | ★★☆☆☆ | 2°C / -5°C | 65mm (snow) | 7 | 5h | 10.1h | Snow · Skiing · Cabin weekends |
| March | ★★☆☆☆ | 5°C / -3°C | 72mm (rain/snow) | 8 | 5h | 11.7h | Cabin weekends · Quiet and local |
| April | ★★★☆☆ | 10°C / 1°C | 75mm | 8 | 6h | 13.4h | Spring greenery |
| May | ★★★★☆ | 15°C / 6°C | 98mm | 11 | 6h | 14.8h | Hiking · Cycling · Spring greenery |
| June | ★★★★☆ | 20°C / 10°C | 102mm | 11 | 5h | 15.5h | Hiking · Cycling |
| July | ★★★★★ | 23°C / 12°C | 78mm | 8 | 5h | 15.2h | Hiking · Cycling |
| August | ★★★★★ | 23°C / 12°C | 92mm | 10 | 11h | 13.9h | Hiking · Cycling · Reliable sunshine |
| September | ★★★★★ | 20°C / 10°C | 82mm | 9 | 11h | 12.3h | Hiking · Cycling · Reliable sunshine |
| October | ★★★★☆ | 15°C / 6°C | 85mm | 9 | 6h | 10.6h | Hiking · Cycling · Autumn colour |
| November | ★★☆☆☆ | 10°C / 1°C | 95mm | 10 | 4h | 9.2h | Autumn colour · Low-angle light · Quiet and local |
| December | ★★☆☆☆ | 5°C / -3°C | 88mm (rain/snow) | 10 | 3h | 8.5h | Cabin weekends · Festive season · Low-angle light |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | August | 11h daily sunshine, 23°C highs and only 10 rain days. |
| City walking & sightseeing | July | 23°C highs with 15.2h of daylight — long days without heat fatigue. |
| Photography & light | August | 11h of sun and 13.9h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | June | Scores 67/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | October | 15°C highs and 6°C nights suit anyone who dislikes heat. |
Each month in Chamonix is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
August is the best all-round month in Chamonix: 23°C highs, 92mm of precipitation and 13.9 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is July to September.
December — 5°C highs, 88mm of precipitation over roughly 10 days and 8.5 hours of daylight. It is the cheapest and least crowded time to go, and it still works for cabin weekends, festive season and low-angle light.
February is the driest month at 65mm over about 7 rain days, against 102mm in June. Across the year Chamonix records around 1250mm.
Yes, but the months are genuinely different trips. August suits hiking, cycling and reliable sunshine, while December suits cabin weekends, festive season and low-angle light. Pick the month that matches what you want to do.
Daylight ranges from 8.5 hours in December to 15.5 hours in June, calculated from the city's latitude.