Click on a day for an hourly weather forecast
The temperatures in Sonderborg in September are usually low and can range between 13°C and 17°C.
You can expect about 3 to 8 days of rain in Sonderborg 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 Sonderborg in September 2025.
If you’re planning to visit Sonderborg in the near future, we highly recommend that you review the 14 day weather forecast for Sonderborg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / 1° | 9 | 12 | 9 | 89 mm | Awful | Sonderborg in January |
| February | 4° / 1° | 8 | 11 | 9 | 69 mm | Awful | Sonderborg in February |
| March | 6° / 3° | 6 | 21 | 4 | 58 mm | Awful | Sonderborg in March |
| April | 10° / 5° | 5 | 24 | 2 | 48 mm | Bad | Sonderborg in April |
| May | 14° / 9° | 7 | 24 | 0 | 89 mm | Ok | Sonderborg in May |
| June | 18° / 12° | 5 | 25 | 0 | 88 mm | Good | Sonderborg in June |
| July | 20° / 15° | 7 | 24 | 0 | 114 mm | Ok | Sonderborg in July |
| August | 20° / 15° | 6 | 25 | 0 | 114 mm | Good | Sonderborg in August |
| September | 17° / 13° | 6 | 24 | 0 | 105 mm | Good | Sonderborg in September |
| October | 13° / 10° | 8 | 23 | 0 | 108 mm | Bad | Sonderborg in October |
| November | 9° / 6° | 9 | 20 | 1 | 97 mm | Bad | Sonderborg in November |
| December | 5° / 3° | 10 | 15 | 7 | 95 mm | Awful | Sonderborg in December |