Harjavalta Weather in May
What's the weather like in Harjavalta (Province of Western Finland) in May 2025?
The climate in Harjavalta during May can be summarized as cool and reasonably dry.
May is in the spring in Harjavalta and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 4°C (39°F) is normal.
| Daytime temperature | 14.9°C 58.8°F |
|---|---|
| Nightly temperature | 3.9°C 39°F |
| Average temperature | 9.4°C 48.9°F |
| Daily sunshine | 8.7 hrs |
| Avg rainfall | 34 mm 1.3 ins |
| Rainy days | 10 days |
| Sea temperature | 4.9°C 40.8°F |
| Humidity | 68% |
| Windspeed | 13.7kph 9 mph |
On average May is the 3rd driest month of the year in Harjavalta with around 34mm 1.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.7 hours of sunshine per day.
May temperatures in Harjavalta
May rainfall
May 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 Harjavalta in May 2025.
Other monthly averages
Harjavalta weather stats
| Hottest month: | July | 20.8°C 69.4°F |
|---|---|---|
| Driest month: | February | 26mm 1ins |
| Sunniest month: | June | 5.1hrs |
| Coldest month: | January | -4°C 24.8°F |
| Wettest month: | August | 80mm 3.1ins |
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