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Trondheim Weather by Month
Average temperatures, rainfall and humidity for Trondheim, Norway, month by month, built from OpenWeather’s historical records. Use it to see what a typical Trondheim month looks like before you travel — then check the live Trondheim forecast for the days ahead.
Warmest month
July
19°C average high
Coolest month
January
-4°C average low
Wettest month
October
129 mm of rain
Driest month
February
58 mm of rain
Average temperature and rainfall in Trondheim by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 1°C | -4°C | -18°C / 10°C | 67 mm | 80% | 14 km/h |
| February | 2°C | -3°C | -20°C / 11°C | 58 mm | 78% | 13 km/h |
| March | 5°C | -1°C | -17°C / 14°C | 91 mm | 75% | 14 km/h |
| April | 8°C | 1°C | -10°C / 20°C | 90 mm | 72% | 12 km/h |
| May | 13°C | 6°C | -1°C / 29°C | 94 mm | 71% | 11 km/h |
| June | 17°C | 9°C | 3°C / 31°C | 112 mm | 75% | 11 km/h |
| July | 19°C | 11°C | 5°C / 34°C | 73 mm | 76% | 10 km/h |
| August | 18°C | 11°C | 4°C / 29°C | 94 mm | 79% | 9 km/h |
| September | 15°C | 9°C | -3°C / 25°C | 119 mm | 79% | 11 km/h |
| October | 9°C | 4°C | -9°C / 19°C | 129 mm | 82% | 12 km/h |
| November | 4°C | 0°C | -15°C / 14°C | 72 mm | 82% | 12 km/h |
| December | 2°C | -2°C | -20°C / 13°C | 89 mm | 82% | 14 km/h |
Best time to visit Trondheim
The most comfortable time to visit Trondheim is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around October, totalling about 1,088 mm a year.
Travellers who prefer heat should aim for July, when highs average 19°C. October is the month to avoid if rain would spoil your plans — it averages 129 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Trondheim forecast for what is happening now.