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Helsinki Weather by Month
Average temperatures, rainfall and humidity for Helsinki, Finland, month by month, built from OpenWeather’s historical records. Use it to see what a typical Helsinki month looks like before you travel — then check the live Helsinki forecast for the days ahead.
Warmest month
July
22°C average high
Coolest month
January
-6°C average low
Wettest month
August
62 mm of rain
Driest month
February
20 mm of rain
Average temperature and rainfall in Helsinki by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | -2°C | -6°C | -28°C / 7°C | 25 mm | 89% | 18 km/h |
| February | -1°C | -6°C | -26°C / 8°C | 20 mm | 87% | 17 km/h |
| March | 3°C | -4°C | -24°C / 14°C | 32 mm | 80% | 17 km/h |
| April | 8°C | 0°C | -11°C / 21°C | 43 mm | 71% | 17 km/h |
| May | 15°C | 6°C | -4°C / 29°C | 45 mm | 67% | 16 km/h |
| June | 20°C | 11°C | 2°C / 31°C | 57 mm | 70% | 16 km/h |
| July | 22°C | 13°C | 5°C / 32°C | 51 mm | 74% | 14 km/h |
| August | 21°C | 13°C | 5°C / 30°C | 62 mm | 78% | 16 km/h |
| September | 16°C | 9°C | -3°C / 26°C | 46 mm | 83% | 16 km/h |
| October | 9°C | 4°C | -8°C / 17°C | 57 mm | 87% | 18 km/h |
| November | 5°C | 1°C | -15°C / 13°C | 50 mm | 89% | 18 km/h |
| December | 1°C | -3°C | -21°C / 11°C | 33 mm | 89% | 18 km/h |
Best time to visit Helsinki
The most comfortable time to visit Helsinki is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 520 mm a year.
Travellers who prefer heat should aim for July, when highs average 22°C. August is the month to avoid if rain would spoil your plans — it averages 62 mm, roughly 3× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Helsinki forecast for what is happening now.