Click on a day for an hourly weather forecast
The temperatures in Altdorf in August are comfortable with low of 13°C and and high up to 24°C.
You can expect rain for roughly half of the month of August in Altdorf. 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.
Our weather forecast can give you a great sense of what weather to expect in Altdorf in August 2025.
If you’re planning to visit Altdorf in the near future, we highly recommend that you review the 14 day weather forecast for Altdorf before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -3° | 7 | 9 | 15 | 111 mm | Awful | Altdorf in January |
| February | 4° / -2° | 6 | 10 | 12 | 81 mm | Awful | Altdorf in February |
| March | 9° / 1° | 6 | 18 | 7 | 76 mm | Bad | Altdorf in March |
| April | 14° / 4° | 5 | 22 | 3 | 59 mm | Ok | Altdorf in April |
| May | 17° / 8° | 11 | 20 | 0 | 157 mm | Ok | Altdorf in May |
| June | 22° / 12° | 9 | 21 | 0 | 187 mm | Ok | Altdorf in June |
| July | 23° / 13° | 9 | 22 | 0 | 174 mm | Good | Altdorf in July |
| August | 24° / 13° | 8 | 23 | 0 | 155 mm | Good | Altdorf in August |
| September | 19° / 10° | 6 | 24 | 0 | 97 mm | Good | Altdorf in September |
| October | 14° / 6° | 6 | 25 | 1 | 79 mm | Good | Altdorf in October |
| November | 9° / 2° | 5 | 21 | 4 | 53 mm | Bad | Altdorf in November |
| December | 4° / -1° | 9 | 12 | 11 | 93 mm | Awful | Altdorf in December |