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July is the hottest month in Helsinki, with an average high of 23°C / 73°F; February is the coldest (-2°C / 28°F). October is the wettest month, averaging 79 mm / 3.1 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | -2 / 29 | -7 / 19 | 54 / 2.1 | 12 |
| Feb | -2 / 28 | -8 / 18 | 41 / 1.6 | 9 |
| Mar | 2 / 36 | -5 / 23 | 34 / 1.3 | 8 |
| Apr | 9 / 48 | 0 / 32 | 36 / 1.4 | 7 |
| May | 16 / 61 | 5 / 42 | 39 / 1.5 | 7 |
| Jun | 20 / 68 | 10 / 50 | 64 / 2.5 | 9 |
| Jul | 23 / 73 | 13 / 56 | 64 / 2.5 | 8 |
| Aug | 21 / 70 | 12 / 54 | 78 / 3.1 | 11 |
| Sep | 16 / 60 | 8 / 46 | 61 / 2.4 | 9 |
| Oct | 9 / 47 | 3 / 37 | 79 / 3.1 | 11 |
| Nov | 3 / 38 | -1 / 30 | 70 / 2.8 | 12 |
| Dec | 0 / 33 | -4 / 24 | 62 / 2.4 | 12 |
Extremes since 1952: highest 34°C / 93°F (July 28, 2010), lowest -36°C / -33°F (January 10, 1987).
Daylight lasts about 18.5 hours in June and 5.5 hours in December.
Data: Meteostat — Helsinki-Vantaa, 1991–2020 averages.
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