The weather in Valais in September is very cold with temperatures between 0°C and 11°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Valais. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
You can expect a few days of snow in Valais during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Valais.
Our weather forecast can give you a great sense of what weather to expect in Valais in September 2025.
If you’re planning to visit Valais in the near future, we highly recommend that you review the 14 day weather forecast for Valais before you arrive.
Temperatures
11° / 0°
Rainy Days
13
Snowy Days
3
Dry Days
14
Rainfall
170
mm
Sun Hours
10.0
Hrs
