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Monthly climate in Merimasku, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Merimasku features a humid continental climate (Dfb). Temperatures typically range between -3 °C (27 °F) and 18 °C (65 °F) through the year, but rarely can drop to -22 °C (-8 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 658 mm (25.9 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually. Merimasku enjoys an average of 3492 hours of sunshine throughout the year, and daylight varies from 5 hours 51 minutes to 18 hours 52 minutes per day.

Monthly average temperatures in Merimasku, Finland

The warmest months in Merimasku are June, July and August, with daily mean temperatures ranging from 16 to 18 °C (61 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -3 to 0 °C (27 - 32 °F) throughout the day. On average each year, Merimasku experiences 8 days above 25 °C (77.0 °F) and 96 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Merimasku. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		7°C
(44°F)		12°C
(53°F)		21°C
(70°F)		26°C
(79°F)		28°C
(83°F)		32°C
(90°F)		28°C
(83°F)		23°C
(73°F)		17°C
(63°F)		13°C
(56°F)		7°C
(46°F)
Mean maximum5°C
(42°F)		5°C
(41°F)		9°C
(48°F)		15°C
(58°F)		22°C
(72°F)		23°C
(75°F)		28°C
(83°F)		24°C
(76°F)		21°C
(69°F)		15°C
(59°F)		11°C
(51°F)		7°C
(44°F)
Average high1°C
(33°F)		-0°C
(32°F)		3°C
(37°F)		7°C
(45°F)		13°C
(56°F)		19°C
(67°F)		21°C
(71°F)		20°C
(68°F)		15°C
(60°F)		10°C
(50°F)		6°C
(43°F)		2°C
(36°F)
Daily mean-1°C
(30°F)		-3°C
(27°F)		-0°C
(32°F)		4°C
(39°F)		9°C
(49°F)		16°C
(61°F)		18°C
(65°F)		17°C
(63°F)		13°C
(55°F)		8°C
(46°F)		4°C
(40°F)		1°C
(33°F)
Average low-3°C
(27°F)		-5°C
(23°F)		-3°C
(27°F)		1°C
(33°F)		5°C
(42°F)		11°C
(53°F)		14°C
(57°F)		14°C
(57°F)		10°C
(50°F)		6°C
(43°F)		3°C
(37°F)		-1°C
(31°F)
Mean minimum-14°C
(7°F)		-15°C
(5°F)		-12°C
(10°F)		-6°C
(21°F)		-1°C
(30°F)		7°C
(45°F)		9°C
(48°F)		8°C
(46°F)		3°C
(38°F)		-2°C
(28°F)		-4°C
(24°F)		-8°C
(18°F)
Minimum-19°C
(-3°F)		-20°C
(-3°F)		-22°C
(-8°F)		-11°C
(13°F)		-3°C
(27°F)		4°C
(39°F)		8°C
(47°F)		6°C
(44°F)		1°C
(33°F)		-4°C
(24°F)		-8°C
(18°F)		-17°C
(1°F)

Compare climate in Merimasku with other places

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

Monthly average precipitation in Merimasku, Finland

Merimasku usually has the most precipitation in August, October and December, with an average of 15 rainy days and 79 mm (3.1 inches) of precipitation per month. The driest months in Merimasku are April, May and June. On average, 36 mm (1.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Merimasku. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.8)41 (1.6)43 (1.7)29 (1.1)38 (1.5)40 (1.6)58 (2.3)70 (2.7)67 (2.6)87 (3.4)59 (2.3)80 (3.1)
Average precipitation days (≥ 1 mm)989877101411161215

Monthly sunshine hours in Merimasku, Finland

The sunniest months in Merimasku are May, June and July, when the sun shines an average of 15 hours 45 minutes a day. Least sunny months in Merimasku: January, November and December receive an average of 2 hours 52 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Merimasku. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours6316227837646149549342631921513070
Mean daily daylight hours6h 41m9h 5m11h 51m14h 40m17h 19m18h 52m18h 1m15h 34m12h 48m10h 1m7h 23m5h 51m

Solar UV radiation in Merimasku, Finland

Merimasku 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 Merimasku UV Index data.

Average daily maximum UV levels by month for Merimasku. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)113457754211