Trondheim
September
Weather in Trondheim for September 2025
Your guide to Trondheim weather in September - trends and predictions
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 experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Trondheim? check out the best time to travel to Trondheim page.
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8
Dry days
22
Rainy days
0
Snow days
14°/8°
Temperatures
14 km/h
Avg max wind
82 %
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 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Trondheim during September?
Significant rainfall exceeding 115.9 mm is expected in Trondheim during September, occurring over more than 22 days. Preparing for wet conditions is recommended in your planning.
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.
What to pack to Trondheim in September?
As you prepare for your trip to Trondheim in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Trondheim, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Trondheim
Explore the daily rainfall trends and prepare for Trondheims September weather 💧
September snowfall in Trondheim
Track daily snowfall levels and discover Trondheim’s snowy potential this September ❄️
UV exposure in Trondheim during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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