Click on a day for an hourly weather forecast
The temperatures in Siegburg in September are usually low and can range between 11°C and 20°C.
You can expect about 3 to 8 days of rain in Siegburg 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 Siegburg in September 2026.
If you’re planning to visit Siegburg in the near future, we highly recommend that you review the 14 day weather forecast for Siegburg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / 0° | 11 | 17 | 2 | 85 mm | Awful | Siegburg in January |
| February | 6° / 0° | 9 | 18 | 1 | 65 mm | Awful | Siegburg in February |
| March | 11° / 2° | 8 | 22 | 1 | 64 mm | Bad | Siegburg in March |
| April | 15° / 5° | 7 | 23 | 0 | 47 mm | Good | Siegburg in April |
| May | 18° / 8° | 9 | 22 | 0 | 71 mm | Ok | Siegburg in May |
| June | 22° / 12° | 8 | 22 | 0 | 78 mm | Ok | Siegburg in June |
| July | 24° / 14° | 9 | 22 | 0 | 87 mm | Good | Siegburg in July |
| August | 24° / 14° | 10 | 21 | 0 | 91 mm | Good | Siegburg in August |
| September | 20° / 11° | 7 | 23 | 0 | 62 mm | Ok | Siegburg in September |
| October | 15° / 8° | 8 | 23 | 0 | 71 mm | Ok | Siegburg in October |
| November | 10° / 4° | 9 | 21 | 0 | 77 mm | Bad | Siegburg in November |
| December | 6° / 2° | 12 | 17 | 2 | 98 mm | Awful | Siegburg in December |