Click on a day for an hourly weather forecast
The temperatures in Kotka in September are usually low and can range between 12°C and 15°C.
You can expect about 3 to 8 days of rain in Kotka 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 Kotka in September 2025.
If you’re planning to visit Kotka in the near future, we highly recommend that you review the 14 day weather forecast for Kotka before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -5° | 7 | 4 | 21 | 87 mm | Awful | Kotka in January |
| February | -3° / -6° | 5 | 5 | 19 | 77 mm | Awful | Kotka in February |
| March | 0° / -4° | 8 | 6 | 18 | 69 mm | Awful | Kotka in March |
| April | 4° / 1° | 7 | 14 | 8 | 59 mm | Awful | Kotka in April |
| May | 10° / 7° | 7 | 23 | 1 | 77 mm | Bad | Kotka in May |
| June | 15° / 12° | 7 | 23 | 0 | 90 mm | Ok | Kotka in June |
| July | 19° / 15° | 6 | 25 | 0 | 114 mm | Good | Kotka in July |
| August | 19° / 15° | 8 | 23 | 0 | 162 mm | Ok | Kotka in August |
| September | 15° / 12° | 7 | 23 | 0 | 121 mm | Ok | Kotka in September |
| October | 9° / 6° | 11 | 16 | 4 | 125 mm | Awful | Kotka in October |
| November | 5° / 3° | 11 | 12 | 8 | 109 mm | Awful | Kotka in November |
| December | 1° / -2° | 10 | 5 | 18 | 110 mm | Awful | Kotka in December |