Trondheim
September
Weather in Trondheim for September 2026
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 17.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.6 °C by the end of September.
Trondheim experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 107.4 mm.
Snow Forecast ❄️
Temperatures
Rain 🌧️
8
Dry days
21
Rainy days
1
Snow days
15°/7°
Temperatures
14 km/h
Avg max wind
78 %
Avg humidity
Trondheim Weather September
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Temperatures trend during September in Trondheim
See the weather trend as well as the moving average line
September weather in Trondheim day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. |  Mist | 18° /7° | 0.2 mm | 0 cm | |
| 2 Sept. |  Cloudy | 17° /8° | 0 mm | 0 cm | |
| 3 Sept. |  Light drizzle | 15° /8° | 0.5 mm | 0 cm | |
| 4 Sept. |  Light rain shower | 18° /11° | 6.2 mm | 0 cm | |
| 5 Sept. | Light rain shower | 18° /10° | 7.8 mm | 0 cm | |
| 6 Sept. |  Overcast | 18° /10° | 1.8 mm | 0 cm | |
| 7 Sept. | Overcast | 21° /10° | 0.1 mm | 0 cm | |
| 8 Sept. | Overcast | 22° /10° | 0.1 mm | 0 cm | |
| 9 Sept. |  Partly cloudy | 21° /9° | 4.2 mm | 0 cm | |
| 10 Sept. | Light rain shower | 15° /9° | 10.6 mm | 0 cm | |
| 11 Sept. | Light rain shower | 18° /9° | 3.1 mm | 0 cm | |
| 12 Sept. | Partly cloudy | 15° /7° | 2.9 mm | 0 cm | |
| 13 Sept. | Overcast | 13° /5° | 0.1 mm | 0 cm | |
| 14 Sept. |  Sunny | 15° /4° | 0 mm | 0 cm | |
| 15 Sept. | Partly cloudy | 15° /5° | 0.9 mm | 0 cm | |
| 16 Sept. | Light rain shower | 13° /5° | 1 mm | 0 cm | |
| 17 Sept. | Partly cloudy | 13° /7° | 4.2 mm | 0 cm | |
| 18 Sept. | Partly cloudy | 17° /7° | 0.5 mm | 0 cm | |
| 19 Sept. | Light rain shower | 16° /9° | 4 mm | 0 cm | |
| 20 Sept. | Light rain shower | 13° /7° | 2.9 mm | 0 cm | |
| 21 Sept. | Light rain | 12° /7° | 8.3 mm | 0 cm | |
| 22 Sept. |  Moderate rain | 12° /6° | 13.2 mm | 0 cm | |
| 23 Sept. | Light rain shower | 10° /6° | 6.5 mm | 0 cm | |
| 24 Sept. | Patchy rain possible | 10° /5° | 1.4 mm | 0 cm | |
| 25 Sept. | Patchy light drizzle | 12° /5° | 9.1 mm | 0 cm | |
| 26 Sept. | Sunny | 14° /6° | 1.1 mm | 0 cm | |
| 27 Sept. | Light rain shower | 12° /4° | 3.1 mm | 0 cm | |
| 28 Sept. | Patchy rain possible | 12° /4° | 7.3 mm | 0.8 cm | |
| 29 Sept. | Light rain shower | 11° /5° | 4.2 mm | 0 cm | |
| 30 Sept. | Overcast | 10° /5° | 2 mm | 0 cm | |
| Next | |||||
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.
Change Month
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 15° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Trondheim during September?
Significant rainfall exceeding 107.4 mm is expected in Trondheim during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Trondheim in September 2026?
Trondheim typically sees 0.796667 cm of snowfall during September.
What are the typical wind conditions in Trondheim during September?
The average wind speed in Trondheim during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
Trondheim snow forecast September 2026
Track daily snowfall levels and discover Trondheim’s snowy potential this September ❄️
On average, Trondheim sees 1 snowy days during September, with approximately 0.8 cm of total snowfall.
September rainfall patterns in Trondheim
Explore the daily rainfall trends and prepare for Trondheims September weather 💧
Typically, Trondheim has 21 rainy days in September with a total of 107.4 mm of rainfall.
UV exposure in Trondheim during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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