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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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -15° | 4 | 6 | 21 | 111 mm | Awful | Valais in January |
| February | -3° / -14° | 3 | 5 | 21 | 112 mm | Awful | Valais in February |
| March | -1° / -11° | 7 | 2 | 24 | 143 mm | Awful | Valais in March |
| April | 2° / -7° | 11 | 2 | 22 | 234 mm | Awful | Valais in April |
| May | 6° / -3° | 19 | 3 | 14 | 319 mm | Awful | Valais in May |
| June | 12° / 1° | 22 | 6 | 2 | 306 mm | Awful | Valais in June |
| July | 15° / 3° | 21 | 9 | 1 | 328 mm | Ok | Valais in July |
| August | 15° / 2° | 20 | 10 | 1 | 292 mm | Ok | Valais in August |
| September | 11° / 0° | 13 | 14 | 3 | 170 mm | Awful | Valais in September |
| October | 6° / -5° | 9 | 13 | 9 | 175 mm | Awful | Valais in October |
| November | 1° / -9° | 5 | 7 | 19 | 227 mm | Awful | Valais in November |
| December | -3° / -14° | 4 | 9 | 18 | 101 mm | Awful | Valais in December |