Click on a day for an hourly weather forecast
The temperatures in Wilhelmshaven 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 Wilhelmshaven 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 Wilhelmshaven in September 2026.
If you’re planning to visit Wilhelmshaven in the near future, we highly recommend that you review the 14 day weather forecast for Wilhelmshaven before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 1° | 9 | 14 | 8 | 90 mm | Awful | Wilhelmshaven in January |
| February | 5° / 1° | 7 | 14 | 7 | 72 mm | Awful | Wilhelmshaven in February |
| March | 8° / 2° | 7 | 21 | 3 | 70 mm | Awful | Wilhelmshaven in March |
| April | 12° / 5° | 5 | 24 | 1 | 55 mm | Ok | Wilhelmshaven in April |
| May | 15° / 8° | 6 | 25 | 0 | 87 mm | Good | Wilhelmshaven in May |
| June | 19° / 11° | 7 | 23 | 0 | 121 mm | Ok | Wilhelmshaven in June |
| July | 21° / 14° | 7 | 24 | 0 | 114 mm | Ok | Wilhelmshaven in July |
| August | 21° / 14° | 7 | 24 | 0 | 110 mm | Ok | Wilhelmshaven in August |
| September | 18° / 12° | 5 | 25 | 0 | 74 mm | Good | Wilhelmshaven in September |
| October | 14° / 8° | 7 | 24 | 0 | 83 mm | Ok | Wilhelmshaven in October |
| November | 9° / 5° | 6 | 22 | 1 | 76 mm | Ok | Wilhelmshaven in November |
| December | 6° / 2° | 10 | 16 | 5 | 91 mm | Awful | Wilhelmshaven in December |