Helsinki, Finland: Annual Weather Averages
July is the hottest month in Helsinki with an average temperature of 16.5°C (62°F) and the coldest is February at -5.5°C (22°F). The wettest month is August with an average of 90mm of rain. The best month to swim in the sea is in August when the average sea temperature is 13.°C (55°F).
Average Temperature: Helsinki
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | -5 | -6 | -2 | 4 | 10 | 14 | 17 | 15 | 10 | 6 | 0 | -4 |
| °F | 23 | 22 | 28 | 38 | 49 | 57 | 62 | 59 | 50 | 42 | 32 | 26 |
Average High/Low Temperature: Helsinki
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | -1 | -1 | 2 | 8 | 15 | 19 | 21 | 19 | 14 | 8 | 2 | 0 |
| Low °C | -9 | -10 | -6 | -1 | 4 | 9 | 12 | 11 | 6 | 3 | -2 | -7 |
| High °F | 30 | 30 | 36 | 46 | 59 | 66 | 70 | 66 | 57 | 46 | 36 | 32 |
| Low °F | 16 | 14 | 21 | 30 | 39 | 48 | 54 | 52 | 43 | 37 | 28 | 19 |
Average Rainfall: Helsinki
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 60 | 40 | 40 | 30 | 40 | 60 | 70 | 90 | 80 | 70 | 80 | 60 |
| Days | 16 | 11 | 12 | 13 | 14 | 17 | 15 | 17 | 15 | 20 | 17 | 16 |
Average Sea Temperature: Helsinki
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 1 | -0 | -0 | 0 | 3 | 8 | 12 | 13 | 10 | 7 | 4 | 2 |
| °F | 33 | 31 | 31 | 33 | 38 | 47 | 54 | 55 | 51 | 44 | 39 | 35 |
