Trondheim
September
Weather in Trondheim for September 2025
Your guide to Trondheim weather in September - trends and predictions
Snowfall in Trondheim during September is quite rare, with fewer than 2 snowy days on average.
In general, the average temperature in Trondheim at the beginning of September is 17.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 10.6 °C by the end of September.
Trondheim in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 117.7 mm.
Snow Forecast ❄️
Temperatures
Rain 🌧️
11
Dry days
18
Rainy days
1
Snow days
14°/7°
Temperatures
13 km/h
Avg max wind
80 %
Avg humidity
Trondheim in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2  16° | 3  14° | 4  17° | 5 17° | 6  20° | 7 22° |
| 8 21° | 9  21° | 10 11° | 11 18° | 12 13° | 13 11° | 14 13° |
| 15 16° | 16 12° | 17 14° | 18 18° | 19 16° | 20 14° | 21 14° |
| 22  13° | 23 11° | 24 10° | 25 11° | 26  13° | 27 11° | 28 11° |
| 29 9° | 30 9° |
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Temperatures trend during September in Trondheim
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. | Mist | 16° /6° | 0.3 mm | 0 cm | |
| 2 Sept. | Cloudy | 16° /7° | 0.1 mm | 0 cm | |
| 3 Sept. | Light drizzle | 14° /7° | 0.8 mm | 0 cm | |
| 4 Sept. | Light rain shower | 17° /11° | 9.3 mm | 0 cm | |
| 5 Sept. | Light rain shower | 17° /10° | 11.1 mm | 0 cm | |
| 6 Sept. | Overcast | 20° /10° | 0.5 mm | 0 cm | |
| 7 Sept. | Overcast | 22° /11° | 0 mm | 0 cm | |
| 8 Sept. | Overcast | 21° /11° | 0.1 mm | 0 cm | |
| 9 Sept. | Partly cloudy | 21° /9° | 6.3 mm | 0 cm | |
| 10 Sept. | Light rain shower | 11° /9° | 15.9 mm | 0 cm | |
| 11 Sept. | Light rain shower | 18° /8° | 4.5 mm | 0 cm | |
| 12 Sept. | Partly cloudy | 13° /6° | 4.4 mm | 0 cm | |
| 13 Sept. | Overcast | 11° /4° | 0.2 mm | 0 cm | |
| 14 Sept. | Overcast | 13° /2° | 0 mm | 0 cm | |
| 15 Sept. | Partly cloudy | 16° /4° | 0 mm | 0 cm | |
| 16 Sept. | Light rain shower | 12° /5° | 1.5 mm | 0 cm | |
| 17 Sept. | Partly cloudy | 14° /6° | 0.5 mm | 0 cm | |
| 18 Sept. | Partly cloudy | 18° /7° | 0.2 mm | 0 cm | |
| 19 Sept. | Light rain shower | 16° /9° | 5.2 mm | 0 cm | |
| 20 Sept. | Light rain shower | 14° /8° | 1.3 mm | 0 cm | |
| 21 Sept. | Light rain | 14° /7° | 2.8 mm | 0 cm | |
| 22 Sept. | Moderate rain | 13° /7° | 6.2 mm | 0 cm | |
| 23 Sept. | Light rain shower | 11° /7° | 4.7 mm | 0 cm | |
| 24 Sept. | Patchy rain possible | 10° /5° | 1.6 mm | 0 cm | |
| 25 Sept. | Patchy light drizzle | 11° /5° | 13.7 mm | 0 cm | |
| 26 Sept. | Sunny | 13° /6° | 1.7 mm | 0 cm | |
| 27 Sept. | Light rain shower | 11° /5° | 4.7 mm | 0 cm | |
| 28 Sept. | Patchy rain possible | 11° /4° | 11 mm | 1.2 cm | |
| 29 Sept. | Light rain shower | 9° /5° | 6.2 mm | 0 cm | |
| 30 Sept. | Light rain shower | 9° /3° | 3 mm | 0 cm | |
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Important Notice
Our weather forecast for Trondheim in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Trondheim forecast closer to your planned date for the most up-to-date weather information.
Trondheim in September - FAQ
What are the expected maximum and minimum temperatures in Trondheim during September?
During September, expect a variety of temperatures with highs around 14° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Trondheim during September?
Significant rainfall exceeding 117.7 mm is expected in Trondheim during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Trondheim in September 2025?
Trondheim typically sees 1.195 cm of snowfall during September.
What are the typical wind conditions in Trondheim during September?
The average wind speed in Trondheim during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Trondheim snow forecast September 2025
Track daily snowfall levels and discover Trondheim’s snowy potential this September ❄️
September rainfall patterns in Trondheim
Explore the daily rainfall trends and prepare for Trondheims September weather 💧
UV exposure in Trondheim during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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