Click on a day for an hourly weather forecast
The temperatures in Heidelberg in September are comfortable with low of 12°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Heidelberg 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 Heidelberg in September 2025.
If you’re planning to visit Heidelberg in the near future, we highly recommend that you review the 14 day weather forecast for Heidelberg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / 0° | 8 | 14 | 9 | 73 mm | Awful | Heidelberg in January |
| February | 6° / 1° | 7 | 16 | 6 | 66 mm | Awful | Heidelberg in February |
| March | 12° / 3° | 6 | 23 | 2 | 55 mm | Bad | Heidelberg in March |
| April | 17° / 7° | 3 | 26 | 1 | 41 mm | Good | Heidelberg in April |
| May | 20° / 9° | 7 | 24 | 0 | 105 mm | Ok | Heidelberg in May |
| June | 24° / 13° | 6 | 24 | 0 | 96 mm | Perfect | Heidelberg in June |
| July | 26° / 15° | 5 | 26 | 0 | 108 mm | Perfect | Heidelberg in July |
| August | 26° / 15° | 5 | 26 | 0 | 89 mm | Perfect | Heidelberg in August |
| September | 22° / 12° | 3 | 27 | 0 | 59 mm | Good | Heidelberg in September |
| October | 16° / 8° | 5 | 26 | 0 | 66 mm | Good | Heidelberg in October |
| November | 10° / 4° | 7 | 22 | 2 | 68 mm | Awful | Heidelberg in November |
| December | 6° / 1° | 10 | 16 | 5 | 93 mm | Awful | Heidelberg in December |