Click on a day for an hourly weather forecast
The temperatures in Mannheim in September are comfortable with low of 11°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Mannheim 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 Mannheim in September 2025.
If you’re planning to visit Mannheim in the near future, we highly recommend that you review the 14 day weather forecast for Mannheim before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 0° | 9 | 13 | 9 | 79 mm | Awful | Mannheim in January |
| February | 6° / 0° | 8 | 14 | 7 | 74 mm | Awful | Mannheim in February |
| March | 11° / 3° | 6 | 22 | 3 | 60 mm | Bad | Mannheim in March |
| April | 16° / 6° | 4 | 25 | 1 | 43 mm | Good | Mannheim in April |
| May | 19° / 9° | 7 | 24 | 0 | 114 mm | Ok | Mannheim in May |
| June | 23° / 12° | 5 | 25 | 0 | 97 mm | Perfect | Mannheim in June |
| July | 25° / 14° | 6 | 25 | 0 | 119 mm | Perfect | Mannheim in July |
| August | 26° / 15° | 5 | 26 | 0 | 88 mm | Perfect | Mannheim in August |
| September | 21° / 11° | 4 | 26 | 0 | 61 mm | Good | Mannheim in September |
| October | 15° / 7° | 6 | 25 | 0 | 66 mm | Good | Mannheim in October |
| November | 9° / 4° | 7 | 21 | 2 | 69 mm | Awful | Mannheim in November |
| December | 6° / 1° | 10 | 15 | 6 | 93 mm | Awful | Mannheim in December |