Click on a day for an hourly weather forecast
The temperatures in Flensborg in September are usually low and can range between 12°C and 18°C.
You can expect about 3 to 8 days of rain in Flensborg 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 Flensborg in September 2025.
If you’re planning to visit Flensborg in the near future, we highly recommend that you review the 14 day weather forecast for Flensborg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / 0° | 10 | 12 | 9 | 95 mm | Awful | Flensborg in January |
| February | 4° / 0° | 8 | 10 | 11 | 74 mm | Awful | Flensborg in February |
| March | 7° / 2° | 7 | 19 | 5 | 63 mm | Awful | Flensborg in March |
| April | 12° / 4° | 5 | 23 | 2 | 44 mm | Bad | Flensborg in April |
| May | 15° / 7° | 7 | 24 | 0 | 78 mm | Ok | Flensborg in May |
| June | 19° / 11° | 5 | 25 | 0 | 77 mm | Good | Flensborg in June |
| July | 21° / 13° | 7 | 24 | 0 | 100 mm | Ok | Flensborg in July |
| August | 21° / 14° | 6 | 25 | 0 | 114 mm | Good | Flensborg in August |
| September | 18° / 12° | 6 | 24 | 0 | 105 mm | Good | Flensborg in September |
| October | 13° / 8° | 8 | 23 | 0 | 116 mm | Bad | Flensborg in October |
| November | 8° / 5° | 9 | 19 | 2 | 100 mm | Awful | Flensborg in November |
| December | 5° / 2° | 10 | 15 | 6 | 105 mm | Awful | Flensborg in December |