Click on a day for an hourly weather forecast
The temperatures in Dortmund in September are usually low and can range between 12°C and 20°C.
You can expect about 3 to 8 days of rain in Dortmund 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 Dortmund in September 2025.
If you’re planning to visit Dortmund in the near future, we highly recommend that you review the 14 day weather forecast for Dortmund before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 0° | 10 | 12 | 9 | 110 mm | Awful | Dortmund in January |
| February | 6° / 1° | 8 | 13 | 7 | 83 mm | Awful | Dortmund in February |
| March | 10° / 3° | 7 | 21 | 3 | 73 mm | Awful | Dortmund in March |
| April | 15° / 6° | 4 | 25 | 1 | 54 mm | Good | Dortmund in April |
| May | 18° / 9° | 7 | 25 | 0 | 83 mm | Ok | Dortmund in May |
| June | 21° / 12° | 5 | 25 | 0 | 86 mm | Good | Dortmund in June |
| July | 23° / 15° | 7 | 24 | 0 | 119 mm | Good | Dortmund in July |
| August | 23° / 15° | 5 | 26 | 0 | 102 mm | Perfect | Dortmund in August |
| September | 20° / 12° | 4 | 26 | 0 | 66 mm | Good | Dortmund in September |
| October | 14° / 8° | 6 | 25 | 0 | 82 mm | Good | Dortmund in October |
| November | 9° / 5° | 7 | 22 | 1 | 82 mm | Bad | Dortmund in November |
| December | 6° / 2° | 10 | 15 | 6 | 124 mm | Awful | Dortmund in December |