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Monthly climate in Helsinki, Finland

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Helsinki features a humid continental climate (Dfb).Temperatures typically range between -3 °C (26 °F) and 18 °C (65 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 32 °C (90 °F).The average annual precipitation amounts to about 794 mm (31.2 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually.Helsinki enjoys an average of 3318 hours of sunshine throughout the year, and daylight varies from 5 hours 56 minutes to 18 hours 45 minutes per day.

Monthly average temperatures in Helsinki, Finland §

The warmest months in Helsinki are June, July and August, with daily mean temperatures ranging from 16 to 18 °C (62 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -1 °C (26 - 31 °F) throughout the day. On average each year, Helsinki experiences 11 days above 25 °C (77.0 °F) and 118 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Helsinki, Finland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 8°C
(46°F)		 6°C
(43°F)		 10°C
(51°F)		 19°C
(67°F)		 27°C
(80°F)		 30°C
(86°F)		 32°C
(90°F)		 29°C
(84°F)		 23°C
(73°F)		 16°C
(62°F)		 12°C
(54°F)		 7°C
(44°F)
Mean maximum 4°C
(40°F)		 4°C
(40°F)		 8°C
(47°F)		 15°C
(59°F)		 23°C
(73°F)		 25°C
(77°F)		 28°C
(83°F)		 25°C
(78°F)		 21°C
(69°F)		 15°C
(59°F)		 10°C
(51°F)		 5°C
(42°F)
Average high -0°C
(31°F)		 -1°C
(30°F)		 2°C
(36°F)		 8°C
(46°F)		 14°C
(57°F)		 20°C
(68°F)		 22°C
(71°F)		 20°C
(68°F)		 15°C
(59°F)		 9°C
(49°F)		 5°C
(41°F)		 1°C
(33°F)
Daily mean -3°C
(28°F)		 -3°C
(26°F)		 -1°C
(31°F)		 4°C
(39°F)		 10°C
(50°F)		 16°C
(62°F)		 18°C
(65°F)		 17°C
(62°F)		 12°C
(54°F)		 7°C
(45°F)		 3°C
(38°F)		 -1°C
(31°F)
Average low -5°C
(23°F)		 -6°C
(21°F)		 -4°C
(24°F)		 -0°C
(32°F)		 5°C
(42°F)		 12°C
(53°F)		 14°C
(57°F)		 13°C
(56°F)		 9°C
(49°F)		 5°C
(41°F)		 1°C
(35°F)		 -3°C
(28°F)
Mean minimum -17°C
(1°F)		 -16°C
(3°F)		 -15°C
(6°F)		 -8°C
(18°F)		 -2°C
(30°F)		 6°C
(43°F)		 9°C
(48°F)		 8°C
(46°F)		 2°C
(36°F)		 -2°C
(28°F)		 -5°C
(24°F)		 -10°C
(15°F)
Minimum -23°C
(-9°F)		 -23°C
(-8°F)		 -22°C
(-7°F)		 -12°C
(10°F)		 -3°C
(27°F)		 3°C
(38°F)		 8°C
(46°F)		 7°C
(45°F)		 -1°C
(31°F)		 -4°C
(25°F)		 -7°C
(19°F)		 -18°C
(0°F)

Compare climate in Helsinki with other places

Compare temperature, precipitation, sunshine, UV index in Helsinki, Finland with other places around the world.

Monthly average precipitation in Helsinki, Finland §

Helsinki usually has the most precipitation in July, August and October, with an average of 14 rainy days and 88 mm (3.4 inches) of precipitation per month.The driest months in Helsinki are February, March and April. On average, 49 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Helsinki, Finland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 55 (2.2) 48 (1.9) 52 (2.0) 48 (1.9) 56 (2.2) 61 (2.4) 91 (3.6) 83 (3.3) 76 (3.0) 89 (3.5) 62 (2.5) 73 (2.9)
Average precipitation days (≥ 1 mm) 11 10 12 9 10 10 13 13 13 17 13 15

Monthly sunshine hours in Helsinki, Finland §

The sunniest months in Helsinki are May, June and July, when the sun shines an average of 15 hours 31 minutes a day.Least sunny months in Helsinki: January, November and December receive an average of 2 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Helsinki, Finland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 55 154 261 362 451 492 484 405 289 190 113 58
Mean daily daylight hours 6h 45m 9h 7m 11h 51m 14h 38m 17h 14m 18h 45m 17h 56m 15h 31m 12h 48m 10h 2m 7h 27m 5h 56m

Solar UV radiation in Helsinki, Finland §

Helsinki experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 5 - 7, which corresponds to the Moderate / High category of sun exposure.January, February and November are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Helsinki UV Index data.

Average daily maximum UV levels by month for Helsinki, Finland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 1 3 4 5 7 7 5 4 2 1 1