Trøndelag (Trondheim)
September
Weather in Trøndelag for September 2025
Your guide to Trøndelag weather in September - trends and predictions
In general, the average temperature in Trøndelag 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.
Trøndelag experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Trøndelag? check out the best time to travel to Trøndelag 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
Trøndelag in September average weather
Move between months or click on a day
| 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 Trøndelag
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 Trøndelag 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 Trøndelag forecast closer to your planned date for the most up-to-date weather information.
Trøndelag in September - FAQ
What are the expected maximum and minimum temperatures in Trøndelag 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 Trøndelag during September?
Significant rainfall exceeding 115.9 mm is expected in Trøndelag during September, occurring over more than 22 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Trøndelag during September?
The average wind speed in Trøndelag during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Trøndelag in September?
As you prepare for your trip to Trøndelag 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 Trøndelag, 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 Trøndelag
Explore the daily rainfall trends and prepare for Trøndelags September weather 💧
September snowfall in Trøndelag
Track daily snowfall levels and discover Trøndelag’s snowy potential this September ❄️
UV exposure in Trøndelag during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Trøndelag?Get accurate weather forecasts for Trøndelag, located at latitude 63.43 and longitude 10.395. Stay updated with localized weather information tailored for Trøndelag.
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