The temperatures in Giessen 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 Giessen 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 Giessen in September 2026.
If you’re planning to visit Giessen in the near future, we highly recommend that you review the 14 day weather forecast for Giessen before you arrive.
Temperatures
19° / 9°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
104
mm
Sun Hours
9.9
Hrs
