June brings 16°C daytime highs, 62mm of precipitation across about 10 wet days and 20 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is June to August. December is the quietest month: short days, quiet streets, and still good for aurora & dark skies, cabin weekends and festive season.
Long-run climate normals for Trondheim. Month ratings compare months within Trondheim only — they are not a ranking of Trondheim against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | June — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | June–August |
| Quietest month | December — Short days, quiet streets |
| Driest month | April — 48mm |
| Wettest month | October — 88mm |
| Warmest / coolest | July 18°C / February 1°C |
| Seasonality | Strongly seasonal — the months feel like different places |
| Annual rainfall | 892mm over roughly 128 rain days |
December gets roughly 32% more precipitation than June — 82mm against 62mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 17°C across the whole year (1–18°C), so timing matters far less here than rainfall does.
June gives you 20 hours of daylight against just 4 in December — a 16-hour difference in how much you can actually fit into a day.
April is the driest month at 48mm across roughly 7 wet days, while October peaks at 88mm.
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 June, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Trondheim changes character completely through the year — June 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 Trondheim, not against destinations worldwide: five stars means the best time to be here, not that Trondheim beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 1°C / -5°C | 78mm (snow) | 12 | 5h | 5.2h | Snow · Skiing · Aurora & dark skies |
| February | ★★☆☆☆ | 1°C / -5°C | 62mm (snow) | 10 | 5h | 8.2h | Snow · Skiing · Cabin weekends |
| March | ★★★☆☆ | 3°C / -3°C | 54mm (rain/snow) | 8 | 5h | 11.4h | Cabin weekends · Low-angle light |
| April | ★★★★☆ | 7°C / 1°C | 48mm (rain/snow) | 7 | 6h | 14.7h | All-round conditions |
| May | ★★★★★ | 12°C / 4°C | 52mm | 8 | 6h | 17.9h | Spring greenery · Long light evenings |
| June | ★★★★★ | 16°C / 8°C | 62mm | 10 | 11h | 20h | Hiking · Cycling · Reliable sunshine |
| July | ★★★★★ | 18°C / 10°C | 72mm | 11 | 11h | 18.8h | Hiking · Cycling · Long light evenings |
| August | ★★★★★ | 18°C / 10°C | 82mm | 13 | 11h | 15.8h | Hiking · Cycling |
| September | ★★★★☆ | 16°C / 8°C | 80mm | 12 | 7h | 12.6h | Hiking · Cycling · Autumn colour |
| October | ★★★☆☆ | 12°C / 4°C | 88mm | 14 | 4h | 9.3h | Autumn colour · Low-angle light |
| November | ★★☆☆☆ | 7°C / 1°C | 72mm (rain/snow) | 11 | 4h | 6.1h | Aurora & dark skies · Autumn colour · Quiet and local |
| December | ★★☆☆☆ | 3°C / -3°C | 82mm (rain/snow) | 13 | 3h | 4h | Aurora & dark skies · Cabin weekends · Festive season |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | June | 11h daily sunshine, 16°C highs and only 10 rain days. |
| City walking & sightseeing | June | 16°C highs with 20h of daylight — long days without heat fatigue. |
| Photography & light | June | 11h of sun and 20h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | May | Scores 64/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | June | 16°C highs and 8°C nights suit anyone who dislikes heat. |
Each month in Trondheim 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.
June is the best all-round month in Trondheim: 16°C highs, 62mm of precipitation and 20 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is June to August.
December — 3°C highs, 82mm of precipitation over roughly 13 days and 4 hours of daylight. It is the cheapest and least crowded time to go, and it still works for aurora & dark skies, cabin weekends and festive season.
April is the driest month at 48mm over about 7 rain days, against 88mm in October. Across the year Trondheim records around 892mm.
Yes, but the months are genuinely different trips. June suits hiking, cycling and reliable sunshine, while December suits aurora & dark skies, cabin weekends and festive season. Pick the month that matches what you want to do.
Daylight ranges from 4 hours in December to 20 hours in June, calculated from the city's latitude.