Mäntyharju Weather in September
What's the weather like in Mäntyharju (Eastern Finland Province) in September 2025?
The climate in Mäntyharju during September can be summarized as cool and reasonably dry.
September is in the fall / autumn in Mäntyharju and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (56°F), whilst at night 6°C (42°F) is normal.
| Daytime temperature | 13.1°C 55.5°F |
|---|---|
| Nightly temperature | 5.8°C 42.4°F |
| Average temperature | 9.4°C 48.9°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 66 mm 2.6 ins |
| Rainy days | 17 days |
| Sea temperature | 13.8°C 56.9°F |
| Humidity | 85% |
| Windspeed | 11.9kph 7 mph |
On average September is the 3rd wettest month of the year in Mäntyharju with around 66mm 2.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Mäntyharju
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Mäntyharju in September 2025.
Other monthly averages
Best places to visit in September
Mäntyharju weather stats
| Hottest month: | July | 21.2°C 70.2°F |
|---|---|---|
| Driest month: | February | 30mm 1.2ins |
| Sunniest month: | June | 4.8hrs |
| Coldest month: | January | -6.5°C 20.3°F |
| Wettest month: | August | 86mm 3.4ins |
© Google