Click on a day for an hourly weather forecast
The temperatures in Arnsberg in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in Arnsberg 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 Arnsberg in September 2026.
If you’re planning to visit Arnsberg in the near future, we highly recommend that you review the 14 day weather forecast for Arnsberg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -1° | 8 | 10 | 13 | 84 mm | Awful | Arnsberg in January |
| February | 5° / -1° | 7 | 11 | 10 | 66 mm | Awful | Arnsberg in February |
| March | 9° / 1° | 8 | 17 | 6 | 63 mm | Awful | Arnsberg in March |
| April | 14° / 4° | 5 | 22 | 3 | 53 mm | Ok | Arnsberg in April |
| May | 17° / 7° | 6 | 25 | 0 | 82 mm | Good | Arnsberg in May |
| June | 21° / 10° | 5 | 25 | 0 | 78 mm | Good | Arnsberg in June |
| July | 23° / 12° | 6 | 25 | 0 | 109 mm | Perfect | Arnsberg in July |
| August | 23° / 13° | 5 | 26 | 0 | 89 mm | Perfect | Arnsberg in August |
| September | 19° / 10° | 4 | 26 | 0 | 55 mm | Good | Arnsberg in September |
| October | 14° / 6° | 6 | 25 | 0 | 62 mm | Good | Arnsberg in October |
| November | 9° / 3° | 6 | 21 | 3 | 65 mm | Bad | Arnsberg in November |
| December | 5° / 1° | 8 | 14 | 8 | 83 mm | Awful | Arnsberg in December |