Jämsä Weather in August
What's the weather like in Jämsä (Province of Western Finland) in August 2025?
The climate in Jämsä during August can be summarized as mild and a little damp.
August is in the summer in Jämsä and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 19°C (66°F), whilst at night 10°C (50°F) is normal.
| Daytime temperature | 18.6°C 65.5°F |
|---|---|
| Nightly temperature | 9.8°C 49.6°F |
| Average temperature | 14.2°C 57.6°F |
| Daily sunshine | 7 hrs |
| Avg rainfall | 87 mm 3.4 ins |
| Rainy days | 17 days |
| Sea temperature | 16.7°C 62.1°F |
| Humidity | 79% |
| Windspeed | 10.1kph 6 mph |
On average August is the wettest month of the year in Jämsä with around 87mm 3.4 inches of rain making it a a little damp 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 7 hours of sunshine per day.
August temperatures in Jämsä
August rainfall
August 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 Jämsä in August 2025.
Other monthly averages
Best places to visit in August
Jämsä weather stats
| Hottest month: | July | 20.8°C 69.4°F |
|---|---|---|
| Driest month: | February | 27mm 1.1ins |
| Sunniest month: | June | 5.3hrs |
| Coldest month: | January | -6.5°C 20.3°F |
| Wettest month: | August | 87mm 3.4ins |
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