The temperatures in St. Gallen in September are quite cold with temperatures between 7°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in St. Gallen during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in St. Gallen in September 2025.
If you’re planning to visit St. Gallen in the near future, we highly recommend that you review the 14 day weather forecast for St. Gallen before you arrive.
Temperatures
19° / 7°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
111
mm
Sun Hours
10.6
Hrs
