The temperatures in Siegen in September are quite cold with temperatures between 9°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Siegen 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 Siegen in September 2026.
If you’re planning to visit Siegen in the near future, we highly recommend that you review the 14 day weather forecast for Siegen before you arrive.
Temperatures
19° / 9°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
69
mm
Sun Hours
9.5
Hrs
