The weather in Grisons in September is very cold with temperatures between 2°C and 12°C, warm clothes are a must.
There’s going to be many days of rain during the month of September in Grisons.
Grisons should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Please note that Grisons can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Grisons in September 2026.
If you’re planning to visit Grisons in the near future, we highly recommend that you review the 14 day weather forecast for Grisons before you arrive.
Temperatures
12° / 2°
Rainy Days
15
Snowy Days
2
Dry Days
14
Rainfall
220
mm
Sun Hours
10.1
Hrs
