Click on a day for an hourly weather forecast
The weather in Andermatt in September is very cold with temperatures between 3°C and 14°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Andermatt. 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.
Please note that Andermatt can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Andermatt in September 2026.
If you’re planning to visit Andermatt in the near future, we highly recommend that you review the 14 day weather forecast for Andermatt before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -15° | 5 | 5 | 21 | 190 mm | Awful | Andermatt in January |
| February | -2° / -14° | 6 | 4 | 21 | 149 mm | Awful | Andermatt in February |
| March | 1° / -11° | 10 | 5 | 20 | 188 mm | Awful | Andermatt in March |
| April | 5° / -5° | 14 | 5 | 13 | 232 mm | Awful | Andermatt in April |
| May | 9° / 0° | 21 | 5 | 6 | 376 mm | Awful | Andermatt in May |
| June | 16° / 5° | 22 | 8 | 0 | 425 mm | Ok | Andermatt in June |
| July | 18° / 7° | 21 | 10 | 0 | 434 mm | Ok | Andermatt in July |
| August | 18° / 6° | 21 | 10 | 0 | 425 mm | Ok | Andermatt in August |
| September | 14° / 3° | 14 | 15 | 1 | 224 mm | Ok | Andermatt in September |
| October | 8° / -3° | 11 | 14 | 6 | 243 mm | Awful | Andermatt in October |
| November | 2° / -8° | 8 | 10 | 13 | 252 mm | Awful | Andermatt in November |
| December | -3° / -13° | 6 | 6 | 20 | 218 mm | Awful | Andermatt in December |