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Monthly climate in Mariehamn, Åland Islands

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Mariehamn features a humid continental climate (Dfb).Temperatures typically range between 0 °C (33 °F) and 17 °C (63 °F) through the year, but rarely can drop to -10 °C (14 °F) or can rise to as high as 24 °C (75 °F).The average annual precipitation amounts to about 592 mm (23.3 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually.Mariehamn enjoys an average of 3469 hours of sunshine throughout the year, and daylight varies from 5 hours 58 minutes to 18 hours 43 minutes per day.

Monthly average temperatures in Mariehamn, Åland Islands §

The warmest months in Mariehamn are July, August and September, with daily mean temperatures ranging from 14 to 17 °C (57 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 0 to 1 °C (33 - 35 °F) throughout the day. On average each year, Mariehamn experiences 0 days above 25 °C (77.0 °F) and 46 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mariehamn, Åland Islands.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)		 7°C
(44°F)		 9°C
(48°F)		 9°C
(48°F)		 15°C
(59°F)		 21°C
(70°F)		 24°C
(75°F)		 23°C
(74°F)		 20°C
(68°F)		 15°C
(59°F)		 13°C
(55°F)		 7°C
(46°F)
Mean maximum 6°C
(43°F)		 5°C
(41°F)		 6°C
(44°F)		 7°C
(45°F)		 12°C
(54°F)		 17°C
(63°F)		 21°C
(71°F)		 20°C
(69°F)		 18°C
(64°F)		 13°C
(56°F)		 10°C
(51°F)		 7°C
(45°F)
Average high 3°C
(37°F)		 1°C
(35°F)		 2°C
(37°F)		 4°C
(40°F)		 8°C
(47°F)		 14°C
(58°F)		 18°C
(64°F)		 18°C
(65°F)		 15°C
(59°F)		 10°C
(51°F)		 7°C
(45°F)		 4°C
(39°F)
Daily mean 1°C
(35°F)		 0°C
(33°F)		 1°C
(35°F)		 3°C
(38°F)		 7°C
(45°F)		 13°C
(56°F)		 17°C
(63°F)		 17°C
(63°F)		 14°C
(57°F)		 9°C
(49°F)		 6°C
(43°F)		 3°C
(37°F)
Average low 0°C
(33°F)		 -1°C
(31°F)		 0°C
(33°F)		 3°C
(37°F)		 6°C
(44°F)		 12°C
(55°F)		 16°C
(61°F)		 16°C
(62°F)		 13°C
(56°F)		 9°C
(48°F)		 5°C
(42°F)		 2°C
(36°F)
Mean minimum -4°C
(25°F)		 -6°C
(22°F)		 -5°C
(24°F)		 -1°C
(31°F)		 2°C
(36°F)		 9°C
(48°F)		 13°C
(55°F)		 14°C
(57°F)		 9°C
(49°F)		 4°C
(40°F)		 1°C
(34°F)		 -2°C
(28°F)
Minimum -8°C
(17°F)		 -10°C
(14°F)		 -10°C
(14°F)		 -1°C
(30°F)		 1°C
(33°F)		 7°C
(44°F)		 11°C
(53°F)		 13°C
(55°F)		 8°C
(46°F)		 3°C
(37°F)		 -2°C
(29°F)		 -8°C
(19°F)

Compare climate in Mariehamn with other places

Compare temperature, precipitation, sunshine, UV index in Mariehamn, Åland Islands with other places around the world.

Monthly average precipitation in Mariehamn, Åland Islands §

Mariehamn usually has the most precipitation in October, November and December, with an average of 16 rainy days and 75 mm (3.0 inches) of precipitation per month.The driest months in Mariehamn are April, May and June. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mariehamn, Åland Islands.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) 48 (1.9) 38 (1.5) 37 (1.5) 24 (1.0) 36 (1.4) 29 (1.1) 45 (1.8) 53 (2.1) 56 (2.2) 90 (3.6) 57 (2.2) 80 (3.1)
Average precipitation days (≥ 1 mm) 11 10 9 7 6 4 7 10 11 17 14 18

Monthly sunshine hours in Mariehamn, Åland Islands §

The sunniest months in Mariehamn are May, June and July, when the sun shines an average of 15 hours 36 minutes a day.Least sunny months in Mariehamn: January, November and December receive an average of 2 hours 58 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mariehamn, Åland Islands.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 66 161 271 368 457 485 493 425 317 216 134 72
Mean daily daylight hours 6h 46m 9h 8m 11h 51m 14h 38m 17h 13m 18h 43m 17h 54m 15h 30m 12h 47m 10h 3m 7h 28m 5h 58m

Solar UV radiation in Mariehamn, Åland Islands §

Mariehamn 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 Mariehamn UV Index data.

Average daily maximum UV levels by month for Mariehamn, Åland Islands.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