Click on a day for an hourly weather forecast
The temperatures in Grasten in September are usually low and can range between 13°C and 17°C.
You can expect about 3 to 8 days of rain in Grasten 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 Grasten in September 2025.
If you’re planning to visit Grasten in the near future, we highly recommend that you review the 14 day weather forecast for Grasten before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / 1° | 8 | 14 | 9 | 56 mm | Awful | Grasten in January |
| February | 4° / 1° | 8 | 11 | 10 | 47 mm | Awful | Grasten in February |
| March | 7° / 2° | 5 | 22 | 4 | 39 mm | Bad | Grasten in March |
| April | 11° / 5° | 4 | 24 | 2 | 32 mm | Bad | Grasten in April |
| May | 14° / 8° | 5 | 26 | 0 | 58 mm | Good | Grasten in May |
| June | 18° / 12° | 4 | 26 | 0 | 60 mm | Good | Grasten in June |
| July | 20° / 14° | 5 | 26 | 0 | 77 mm | Good | Grasten in July |
| August | 20° / 15° | 5 | 26 | 0 | 81 mm | Good | Grasten in August |
| September | 17° / 13° | 4 | 26 | 0 | 68 mm | Good | Grasten in September |
| October | 13° / 9° | 6 | 25 | 0 | 67 mm | Ok | Grasten in October |
| November | 9° / 6° | 6 | 22 | 2 | 58 mm | Bad | Grasten in November |
| December | 5° / 3° | 6 | 19 | 6 | 58 mm | Awful | Grasten in December |