Click on a day for an hourly weather forecast
The temperatures in Karjaa 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 Karjaa 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 Karjaa in September 2026.
If you’re planning to visit Karjaa in the near future, we highly recommend that you review the 14 day weather forecast for Karjaa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -5° | 7 | 6 | 20 | 86 mm | Awful | Karjaa in January |
| February | -2° / -5° | 6 | 5 | 19 | 76 mm | Awful | Karjaa in February |
| March | 1° / -3° | 8 | 9 | 16 | 65 mm | Awful | Karjaa in March |
| April | 5° / 2° | 6 | 18 | 6 | 54 mm | Awful | Karjaa in April |
| May | 11° / 7° | 6 | 24 | 1 | 71 mm | Ok | Karjaa in May |
| June | 16° / 11° | 6 | 24 | 0 | 92 mm | Good | Karjaa in June |
| July | 20° / 15° | 6 | 25 | 0 | 119 mm | Good | Karjaa in July |
| August | 19° / 15° | 8 | 23 | 0 | 147 mm | Ok | Karjaa in August |
| September | 15° / 12° | 7 | 23 | 0 | 111 mm | Ok | Karjaa in September |
| October | 9° / 6° | 10 | 18 | 3 | 118 mm | Awful | Karjaa in October |
| November | 5° / 3° | 10 | 13 | 6 | 106 mm | Awful | Karjaa in November |
| December | 1° / -1° | 10 | 5 | 16 | 105 mm | Awful | Karjaa in December |