The temperatures in Thun in September are quite cold with temperatures between 5°C and 17°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Thun. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Thun in September 2025.
If you’re planning to visit Thun in the near future, we highly recommend that you review the 14 day weather forecast for Thun before you arrive.
Temperatures
17° / 5°
Rainy Days
8
Snowy Days
0
Dry Days
22
Rainfall
131
mm
Sun Hours
10.7
Hrs
