The temperatures in Porvoo 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 Porvoo 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 Porvoo in September 2025.
If you’re planning to visit Porvoo in the near future, we highly recommend that you review the 14 day weather forecast for Porvoo before you arrive.
Temperatures
15° / 10°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
86
mm
Sun Hours
8.8
Hrs
