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Monthly climate in Hanko, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hanko features a humid continental climate (Dfb). Temperatures typically range between -1 °C (31 °F) and 17 °C (63 °F) through the year, but rarely can drop to -13 °C (8 °F) or can rise to as high as 25 °C (76 °F). The average annual precipitation amounts to about 762 mm (30.0 inches) and receives 145 rainy days on the 1 mm (0.04 inches) threshold annually. Hanko enjoys an average of 3488 hours of sunshine throughout the year, and daylight varies from 6 hours 3 minutes to 18 hours 38 minutes per day.

Monthly average temperatures in Hanko, Finland

The warmest months in Hanko 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 -1 to 1 °C (31 - 33 °F) throughout the day. On average each year, Hanko experiences 0 days above 25 °C (77.0 °F) and 58 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hanko. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		6°C
(43°F)		7°C
(44°F)		9°C
(49°F)		18°C
(64°F)		22°C
(73°F)		25°C
(76°F)		23°C
(73°F)		20°C
(68°F)		16°C
(61°F)		13°C
(56°F)		8°C
(46°F)
Mean maximum5°C
(42°F)		4°C
(39°F)		5°C
(41°F)		7°C
(45°F)		13°C
(56°F)		17°C
(63°F)		22°C
(72°F)		20°C
(69°F)		18°C
(65°F)		14°C
(57°F)		11°C
(51°F)		7°C
(45°F)
Average high2°C
(36°F)		0°C
(33°F)		2°C
(35°F)		4°C
(40°F)		9°C
(48°F)		15°C
(59°F)		18°C
(65°F)		18°C
(65°F)		15°C
(59°F)		11°C
(51°F)		7°C
(45°F)		4°C
(39°F)
Daily mean1°C
(33°F)		-1°C
(31°F)		0°C
(33°F)		3°C
(38°F)		8°C
(46°F)		14°C
(57°F)		17°C
(63°F)		17°C
(63°F)		14°C
(57°F)		10°C
(49°F)		6°C
(43°F)		2°C
(36°F)
Average low-1°C
(31°F)		-2°C
(28°F)		-1°C
(31°F)		2°C
(36°F)		7°C
(44°F)		13°C
(56°F)		16°C
(62°F)		17°C
(62°F)		13°C
(56°F)		9°C
(48°F)		5°C
(41°F)		1°C
(34°F)
Mean minimum-8°C
(18°F)		-8°C
(18°F)		-6°C
(22°F)		-1°C
(31°F)		2°C
(36°F)		9°C
(49°F)		13°C
(56°F)		13°C
(56°F)		9°C
(48°F)		2°C
(36°F)		-0°C
(32°F)		-4°C
(26°F)
Minimum-13°C
(8°F)		-13°C
(10°F)		-10°C
(13°F)		-2°C
(29°F)		1°C
(35°F)		6°C
(44°F)		12°C
(53°F)		11°C
(51°F)		7°C
(45°F)		1°C
(35°F)		-3°C
(26°F)		-9°C
(17°F)

Compare climate in Hanko with other places

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

Monthly average precipitation in Hanko, Finland

Hanko usually has the most precipitation in August, October and November, with an average of 16 rainy days and 99 mm (3.9 inches) of precipitation per month. The driest months in Hanko are April, May and June. On average, 34 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hanko. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)56 (2.2)49 (1.9)50 (2.0)28 (1.1)36 (1.4)37 (1.5)57 (2.2)94 (3.7)71 (2.8)123 (4.8)82 (3.2)80 (3.1)
Average precipitation days (≥ 1 mm)14111077681314191719

Monthly sunshine hours in Hanko, Finland

The sunniest months in Hanko are May, June and July, when the sun shines an average of 15 hours 37 minutes a day. Least sunny months in Hanko: 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 Hanko. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours6517027637746148948741831921513473
Mean daily daylight hours6h 50m9h 10m11h 51m14h 36m17h 9m18h 38m17h 50m15h 28m12h 47m10h 4m7h 31m6h 3m

Solar UV radiation in Hanko, Finland

Hanko 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 Hanko UV Index data.

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