Trondheim
September
Weather in Trondheim for September 2026
Your guide to Trondheim weather in September - trends and predictions
Until now, September 2026 in Trondheim is cooler than usual, with temperatures averaging 13.1 °C, this is 2.8 °C below the typical seasonal average.
The forecast for the upcoming days in Trondheim predicts a temperature of 12.1 °C, which is slightly above the historical average.
In general, the average temperature in Trondheim at the beginning of September is 16.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.1 °C by the end of September.
The climate of Trondheim in September is notably wet, with an average of 12 rainy days, and a total of 107.4 mm of precipitation.
Temperatures
Rain 🌧️
18
Dry days
12
Rainy days
0
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 | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Mist | 17° /7° | 0.2 mm | 4 | |
| 2 Sept. |  Cloudy | 16° /8° | 1 mm | 3 | |
| 3 Sept. |  Light drizzle | 14° /8° | 1.4 mm | 3 | |
| 4 Sept. |  Light rain shower | 18° /9° | 4.7 mm | 4 | |
| 5 Sept. | Light rain shower | 17° /9° | 6 mm | 4 | |
| 6 Sept. |  Overcast | 17° /9° | 2.4 mm | 3 | |
| 7 Sept. | Overcast | 19° /10° | 4.5 mm | 4 | |
| 8 Sept. | Overcast | 19° /9° | 3.2 mm | 4 | |
| 9 Sept. |  Partly cloudy | 18° /8° | 5.8 mm | 4 | |
| 10 Sept. | Light rain shower | 14° /8° | 8.5 mm | 3 | |
| 11 Sept. | Light rain shower | 18° /8° | 2.7 mm | 3 | |
| 12 Sept. | Partly cloudy | 15° /7° | 2.9 mm | 3 | |
| 13 Sept. | Overcast | 13° /6° | 0.9 mm | 3 | |
| 14 Sept. | Overcast | 15° /4° | 0 mm | 3 | |
| 15 Sept. | Partly cloudy | 15° /5° | 1.1 mm | 3 | |
| 16 Sept. | Light rain shower | 12° /6° | 3.5 mm | 2 | |
| 17 Sept. | Partly cloudy | 13° /7° | 4.2 mm | 3 | |
| 18 Sept. | Partly cloudy | 17° /7° | 0.5 mm | 4 | |
| 19 Sept. | Patchy rain possible | 11° /9° | 8.5 mm | 1.1 | |
| 20 Sept. | Light rain shower | 12° /9° | 3.2 mm | 1.2 | |
| 21 Sept. | Patchy rain possible | 11° /9° | 5.7 mm | 1.1 | |
| 22 Sept. | Patchy rain possible | 10° /8° | 1.4 mm | 2 | |
| 23 Sept. | Light rain shower | 10° /9° | 20.9 mm | 3 | |
| 24 Sept. | Patchy rain possible | 12° /9° | 0.8 mm | 3 | |
| 25 Sept. | Overcast | 12° /10° | 0.1 mm | 3 | |
| 26 Sept. | Patchy rain possible | 11° /10° | 0.5 mm | 4 | |
| 27 Sept. | Overcast | 12° /9° | 1.2 mm | 3 | |
| 28 Sept. | Overcast | 13° /9° | 1.8 mm | 3 | |
| 29 Sept. | Light rain shower | 12° /9° | 5.4 mm | 3 | |
| 30 Sept. | Patchy rain possible | 13° /10° | 1.5 mm | 3 | |
| 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.
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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 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Trondheim in September 2026?
Trondheim typically sees 0.8 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.
September rainfall patterns in Trondheim
Explore the daily rainfall trends and prepare for Trondheims September weather 💧
Typically, Trondheim has 12 rainy days in September with a total of 107.4 mm of rainfall.
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