Click on a day for an hourly weather forecast
The temperatures in Oulu in September are quite cold with temperatures between 8°C and 13°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Oulu 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 Oulu in September 2025.
If you’re planning to visit Oulu in the near future, we highly recommend that you review the 14 day weather forecast for Oulu before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -11° | 3 | 6 | 22 | 70 mm | Awful | Oulu in January |
| February | -6° / -11° | 2 | 5 | 21 | 64 mm | Awful | Oulu in February |
| March | -2° / -7° | 5 | 7 | 19 | 68 mm | Awful | Oulu in March |
| April | 3° / -2° | 7 | 11 | 13 | 56 mm | Awful | Oulu in April |
| May | 11° / 4° | 7 | 20 | 3 | 65 mm | Awful | Oulu in May |
| June | 16° / 9° | 6 | 24 | 0 | 68 mm | Good | Oulu in June |
| July | 20° / 12° | 7 | 24 | 0 | 114 mm | Ok | Oulu in July |
| August | 18° / 11° | 6 | 25 | 0 | 101 mm | Good | Oulu in August |
| September | 13° / 8° | 6 | 24 | 0 | 64 mm | Ok | Oulu in September |
| October | 6° / 2° | 6 | 19 | 6 | 65 mm | Awful | Oulu in October |
| November | 1° / -2° | 8 | 9 | 13 | 80 mm | Awful | Oulu in November |
| December | -4° / -7° | 6 | 4 | 22 | 81 mm | Awful | Oulu in December |