The average temperature in Helsinki is 18°C (64°F) in summer, but it can soar to above 30 (86°F) during the occasional heat wave. The winters are not terribly cold, averaging around -5°C (+23°F) or so - but great fluctuations are possible during the winter or summer.
Average maximum midday temperatures in Helsinki in Fahrenheit and Celcius:
Month /
Fahrenheit /
Celsius
January /
26F /
-3.1C
February /
27F /
-3.0C
March /
33F /
0.6C
April /
43.5F /
6.4C
May /
56.7F /
13.7C
June /
66F /
18.9C
July /
68.9F /
20.5C
August /
66.4F /
19.1C
September /
57F /
13.9C
October /
47.7F /
8.7C
November /
38.8F /
3.5C
December /
31.3F /
-0.4C
Today weather:
