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Weather in Thun for September 2025

Your guide to Thun weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Thun is cooler than usual, with temperatures averaging 16.8 °C, this is -2.5 °C below the typical seasonal average.

  • The forecast for the next days in Thun predicts temperatures to be around 19 °C, close to the historical average.

  • In general, the average temperature in Thun at the beginning of September is 20.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.4 °C by the end of September.

    • Rain 🌧️

  • Thun experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 122.7 mm.

Average dry days
8
Dry days
Average rainy days
22
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/7°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Thun Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Partly cloudy
20°
2
Light rain shower
18°
3
Sunny
21°
4
Cloudy
20°
5
Sunny
18°
6
Sunny
22°
7
Sunny
24°
8
Sunny
22°
9
Patchy rain possible
18°
10
Sunny
17°
11
Sunny
19°
12
Light rain shower
17°
13
Moderate or heavy rain shower
15°
14
Fog
11°
15
Moderate rain
21°
16
Patchy rain possible
13°
17
Partly cloudy
16°
18
Sunny
24°
19
Sunny
25°
20
Sunny
27°
21
Patchy rain possible
21°
22
Patchy rain possible
17°
23
Moderate rain
19°
24
Patchy rain possible
18°
25
Patchy rain possible
17°
26
Moderate rain
13°
27
Partly cloudy
16°
28
Partly cloudy
15°
29
Sunny
16°
30
Mist
20°

Temperatures trend during September in Thun

See the weather trend as well as the moving average line

September weather in Thun day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 20° /7° 8.2 mm 5
2 Sept. Light rain shower
Light rain shower
 18° /8° 10.1 mm 4
3 Sept. Sunny
Sunny
 21° /8° 6.3 mm 5
4 Sept. Cloudy
Cloudy
 20° /7° 15.2 mm 5
5 Sept. Sunny
Sunny
 18° /7° 3.9 mm 4
6 Sept. Sunny
Sunny
 22° /10° 0.1 mm 6
7 Sept. Sunny
Sunny
 24° /12° 0 mm 6
8 Sept. Sunny
Sunny
 22° /12° 5.8 mm 6
9 Sept. Patchy rain possible
Patchy rain possible
 18° /9° 10.1 mm 4
10 Sept. Sunny
Sunny
 17° /7° 2 mm 4
11 Sept. Sunny
Sunny
 19° /9° 4.4 mm 5
12 Sept. Light rain shower
Light rain shower
 17° /8° 4.8 mm 4
13 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /6° 9.5 mm 3
14 Sept. Fog
Fog
 11° /3° 0.4 mm 3
15 Sept. Moderate rain
Moderate rain
 21° /7° 10.4 mm 1.4
16 Sept. Patchy rain possible
Patchy rain possible
 13° /4° 1.6 mm 0.5
17 Sept. Partly cloudy
Partly cloudy
 16° /6° 0 mm 0.7
18 Sept. Sunny
Sunny
 24° /13° 0 mm 1.5
19 Sept. Sunny
Sunny
 25° /13° 0 mm 5
20 Sept. Sunny
Sunny
 27° /15° 0 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 21° /16° 0.2 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
 17° /14° 2.2 mm 4
23 Sept. Moderate rain
Moderate rain
 19° /11° 5.8 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 0.8 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 17° /7° 2.6 mm 3
26 Sept. Moderate rain
Moderate rain
 13° /3° 5.5 mm 2
27 Sept. Partly cloudy
Partly cloudy
 16° /6° 0 mm 4
28 Sept. Partly cloudy
Partly cloudy
 15° /7° 5.7 mm 4
29 Sept. Sunny
Sunny
 16° /8° 0.1 mm 5
30 Sept. Mist
Mist
 20° /10° 1.1 mm 5
Next
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.
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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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Location coordinates Where is Thun?

Get accurate weather forecasts for Thun, located at latitude 46.751 and longitude 7.622. Stay updated with localized weather information tailored for Thun.

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