Helsinki Weather in May
What's the weather like in Helsinki (Province of Western Finland) in May 2025?
The climate in Helsinki during May can be summarized as cool and dry.
May is in the spring in Helsinki and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (54°F), whilst at night 4°C (40°F) is normal.
| Daytime temperature | 12.5°C 54.4°F |
|---|---|
| Nightly temperature | 4.4°C 39.8°F |
| Average temperature | 8.4°C 47.1°F |
| Daily sunshine | 8.8 hrs |
| Avg rainfall | 30 mm 1.2 ins |
| Rainy days | 9 days |
| Sea temperature | 5.3°C 41.6°F |
| Humidity | 76% |
| Windspeed | 15.8kph 10 mph |
On average May is the 3rd driest month of the year in Helsinki with around 30mm 1.2 inches of rain making it a dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.8 hours of sunshine per day.
May temperatures in Helsinki
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 Helsinki in May 2025.
Other monthly averages
Helsinki weather stats
| Hottest month: | July | 19.5°C 67.1°F |
|---|---|---|
| Driest month: | February | 25mm 1ins |
| Sunniest month: | June | 10.7hrs |
| Coldest month: | February | -2.7°C 27.1°F |
| Wettest month: | August | 75mm 3ins |
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