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.
Temperatures
13° / 8°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
64
mm
Sun Hours
8.0
Hrs
