Click on a day for an hourly weather forecast
The temperatures in Hamm in September are usually low and can range between 11°C and 19°C.
You can expect about 3 to 8 days of rain in Hamm 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 Hamm in September 2025.
If you’re planning to visit Hamm in the near future, we highly recommend that you review the 14 day weather forecast for Hamm before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 0° | 10 | 8 | 13 | 125 mm | Awful | Hamm in January |
| February | 5° / 0° | 9 | 9 | 11 | 94 mm | Awful | Hamm in February |
| March | 9° / 2° | 8 | 16 | 6 | 87 mm | Awful | Hamm in March |
| April | 14° / 5° | 6 | 22 | 2 | 68 mm | Ok | Hamm in April |
| May | 17° / 8° | 7 | 24 | 0 | 102 mm | Ok | Hamm in May |
| June | 21° / 11° | 6 | 24 | 0 | 107 mm | Good | Hamm in June |
| July | 23° / 14° | 7 | 24 | 0 | 125 mm | Good | Hamm in July |
| August | 23° / 14° | 5 | 26 | 0 | 101 mm | Perfect | Hamm in August |
| September | 19° / 11° | 5 | 25 | 0 | 71 mm | Good | Hamm in September |
| October | 14° / 7° | 7 | 23 | 0 | 83 mm | Ok | Hamm in October |
| November | 9° / 4° | 8 | 19 | 3 | 92 mm | Awful | Hamm in November |
| December | 5° / 1° | 11 | 11 | 9 | 133 mm | Awful | Hamm in December |