Click on a day for an hourly weather forecast
The temperatures in Turku in September are usually low and can range between 10°C and 15°C.
You can expect about 3 to 8 days of rain in Turku 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 Turku in September 2025.
If you’re planning to visit Turku in the near future, we highly recommend that you review the 14 day weather forecast for Turku before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -6° | 6 | 7 | 18 | 66 mm | Awful | Turku in January |
| February | -2° / -6° | 5 | 6 | 18 | 52 mm | Awful | Turku in February |
| March | 1° / -3° | 6 | 9 | 15 | 51 mm | Awful | Turku in March |
| April | 7° / 1° | 6 | 18 | 6 | 41 mm | Bad | Turku in April |
| May | 13° / 6° | 5 | 25 | 1 | 61 mm | Ok | Turku in May |
| June | 17° / 10° | 6 | 24 | 0 | 63 mm | Good | Turku in June |
| July | 21° / 14° | 6 | 25 | 0 | 89 mm | Good | Turku in July |
| August | 20° / 14° | 5 | 26 | 0 | 94 mm | Good | Turku in August |
| September | 15° / 10° | 5 | 25 | 0 | 76 mm | Good | Turku in September |
| October | 9° / 5° | 7 | 21 | 3 | 83 mm | Awful | Turku in October |
| November | 5° / 2° | 7 | 17 | 6 | 71 mm | Awful | Turku in November |
| December | 1° / -2° | 8 | 9 | 14 | 80 mm | Awful | Turku in December |