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The temperatures in Switzerland 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 Switzerland 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 Switzerland in September 2025.
If you’re planning to visit Switzerland in the near future, we highly recommend that you review the 14 day weather forecast for Switzerland before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -3° | 6 | 13 | 12 | 91 mm | Awful | Switzerland in January |
| February | 5° / -2° | 6 | 12 | 10 | 75 mm | Awful | Switzerland in February |
| March | 11° / 0° | 6 | 19 | 6 | 65 mm | Bad | Switzerland in March |
| April | 16° / 4° | 5 | 24 | 2 | 55 mm | Ok | Switzerland in April |
| May | 19° / 7° | 8 | 23 | 0 | 120 mm | Ok | Switzerland in May |
| June | 23° / 11° | 7 | 23 | 0 | 120 mm | Good | Switzerland in June |
| July | 25° / 12° | 6 | 25 | 0 | 136 mm | Perfect | Switzerland in July |
| August | 25° / 12° | 5 | 26 | 0 | 96 mm | Perfect | Switzerland in August |
| September | 21° / 9° | 3 | 27 | 0 | 67 mm | Good | Switzerland in September |
| October | 15° / 5° | 5 | 26 | 0 | 75 mm | Good | Switzerland in October |
| November | 9° / 2° | 6 | 20 | 4 | 69 mm | Bad | Switzerland in November |
| December | 5° / -2° | 7 | 15 | 9 | 105 mm | Awful | Switzerland in December |