The temperatures in Rheinfelden in September are quite cold with temperatures between 9°C and 21°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Rheinfelden 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 Rheinfelden in September 2026.
If you’re planning to visit Rheinfelden in the near future, we highly recommend that you review the 14 day weather forecast for Rheinfelden before you arrive.
Temperatures
21° / 9°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
92
mm
Sun Hours
7.2
Hrs
