Thun
September
Weather in Thun for September 2025
Your guide to Thun weather in September - trends and predictions
In general, the average temperature in Thun at the beginning of September is 21.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °C by the end of September.
Thun experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 122.7 mm.
Temperatures
Rain 🌧️
8
Dry days
22
Rainy days
0
Snow days
18°/7°
Temperatures
8 km/h
Avg max wind
77 %
Avg humidity
Thun Weather September
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2 21° | 3  22° | 4  19° | 5 21° | 6 23° | 7 25° |
| 8 23° | 9  19° | 10 19° | 11 21° | 12  17° | 13  13° | 14  11° |
| 15 16° | 16 18° | 17 16° | 18 16° | 19 16° | 20 20° | 21 21° |
| 22  16° | 23 13° | 24 15° | 25 17° | 26 16° | 27 17° | 28 15° |
| 29 16° | 30 20° |
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Temperatures trend during September in Thun
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 22° /8° | 2 mm | 6 | |
| 2 Sept. | Partly cloudy | 21° /10° | 5.8 mm | 5 | |
| 3 Sept. | Sunny | 22° /9° | 9.4 mm | 6 | |
| 4 Sept. | Cloudy | 19° /8° | 5.9 mm | 5 | |
| 5 Sept. | Sunny | 21° /9° | 1.8 mm | 5 | |
| 6 Sept. | Sunny | 23° /12° | 0.1 mm | 6 | |
| 7 Sept. | Sunny | 25° /13° | 0 mm | 7 | |
| 8 Sept. | Sunny | 23° /11° | 6.7 mm | 6 | |
| 9 Sept. | Patchy rain possible | 19° /7° | 6.1 mm | 5 | |
| 10 Sept. | Sunny | 19° /7° | 0.4 mm | 5 | |
| 11 Sept. | Sunny | 21° /10° | 6.2 mm | 6 | |
| 12 Sept. | Thundery outbreaks possible | 17° /8° | 6.6 mm | 4 | |
| 13 Sept. | Moderate or heavy rain shower | 13° /5° | 11.4 mm | 3 | |
| 14 Sept. | Fog | 11° /3° | 0.4 mm | 3 | |
| 15 Sept. | Partly cloudy | 16° /4° | 0 mm | 4 | |
| 16 Sept. | Light rain shower | 18° /4° | 2.2 mm | 4 | |
| 17 Sept. | Sunny | 16° /4° | 0.1 mm | 5 | |
| 18 Sept. | Light rain shower | 16° /3° | 6.7 mm | 4 | |
| 19 Sept. | Patchy rain possible | 16° /6° | 1.5 mm | 4 | |
| 20 Sept. | Patchy rain possible | 20° /7° | 1.1 mm | 5 | |
| 21 Sept. | Patchy rain possible | 21° /10° | 2.3 mm | 5 | |
| 22 Sept. | Patchy light rain with thunder | 16° /8° | 10 mm | 4 | |
| 23 Sept. | Light rain shower | 13° /5° | 5.8 mm | 3 | |
| 24 Sept. | Sunny | 15° /3° | 1.8 mm | 4 | |
| 25 Sept. | Sunny | 17° /4° | 0 mm | 5 | |
| 26 Sept. | Sunny | 16° /6° | 19.8 mm | 4 | |
| 27 Sept. | Sunny | 17° /7° | 1.7 mm | 5 | |
| 28 Sept. | Partly cloudy | 15° /7° | 5.7 mm | 4 | |
| 29 Sept. | Sunny | 16° /8° | 0.1 mm | 5 | |
| 30 Sept. | Mist | 20° /10° | 1.1 mm | 5 | |
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Important Notice
Our weather forecast for Thun 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 Thun forecast closer to your planned date for the most up-to-date weather information.
Thun in September - FAQ
What are the expected maximum and minimum temperatures in Thun during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Thun during September?
Significant rainfall exceeding 122.7 mm is expected in Thun during September, occurring over more than 22 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Thun during September?
The average wind speed in Thun during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Thun
Explore the daily rainfall trends and prepare for Thuns September weather 💧
UV exposure in Thun during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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