Click on a day for an hourly weather forecast
The temperatures in Cologne 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 Cologne 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 Cologne in September 2025.
If you’re planning to visit Cologne in the near future, we highly recommend that you review the 14 day weather forecast for Cologne before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 0° | 8 | 14 | 9 | 64 mm | Awful | Cologne in January |
| February | 6° / 1° | 7 | 15 | 6 | 53 mm | Awful | Cologne in February |
| March | 10° / 3° | 6 | 22 | 3 | 45 mm | Bad | Cologne in March |
| April | 15° / 6° | 4 | 25 | 1 | 35 mm | Good | Cologne in April |
| May | 18° / 8° | 5 | 26 | 0 | 66 mm | Good | Cologne in May |
| June | 21° / 12° | 5 | 25 | 0 | 74 mm | Good | Cologne in June |
| July | 23° / 14° | 6 | 25 | 0 | 86 mm | Perfect | Cologne in July |
| August | 23° / 14° | 4 | 27 | 0 | 67 mm | Perfect | Cologne in August |
| September | 20° / 11° | 3 | 27 | 0 | 47 mm | Good | Cologne in September |
| October | 15° / 8° | 5 | 26 | 0 | 50 mm | Good | Cologne in October |
| November | 9° / 4° | 6 | 22 | 2 | 47 mm | Bad | Cologne in November |
| December | 6° / 2° | 9 | 17 | 6 | 71 mm | Awful | Cologne in December |