Click on a day for an hourly weather forecast
The temperatures in Sarnen in August are quite cold with temperatures between 8°C and 17°C, warm clothes are a must.
There’s going to be many days of rain during the month of August in Sarnen.
Sarnen should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Sarnen in August 2025.
If you’re planning to visit Sarnen in the near future, we highly recommend that you review the 14 day weather forecast for Sarnen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -10° | 9 | 7 | 15 | 149 mm | Awful | Sarnen in January |
| February | -1° / -9° | 9 | 5 | 15 | 115 mm | Awful | Sarnen in February |
| March | 2° / -6° | 11 | 10 | 11 | 144 mm | Awful | Sarnen in March |
| April | 6° / -3° | 12 | 14 | 4 | 172 mm | Awful | Sarnen in April |
| May | 9° / 1° | 19 | 11 | 1 | 294 mm | Bad | Sarnen in May |
| June | 14° / 5° | 18 | 12 | 0 | 294 mm | Ok | Sarnen in June |
| July | 17° / 7° | 17 | 14 | 0 | 287 mm | Ok | Sarnen in July |
| August | 17° / 8° | 16 | 15 | 0 | 274 mm | Ok | Sarnen in August |
| September | 13° / 4° | 10 | 20 | 0 | 152 mm | Bad | Sarnen in September |
| October | 8° / 0° | 8 | 22 | 1 | 146 mm | Bad | Sarnen in October |
| November | 3° / -4° | 8 | 15 | 7 | 139 mm | Awful | Sarnen in November |
| December | -1° / -8° | 8 | 11 | 12 | 129 mm | Awful | Sarnen in December |