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Monthly climate in Kustavi, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Kustavi features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 17 °C (63 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 26 °C (80 °F). The average annual precipitation amounts to about 681 mm (26.8 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually. Kustavi enjoys an average of 3519 hours of sunshine throughout the year, and daylight varies from 5 hours 49 minutes to 18 hours 53 minutes per day.

Monthly average temperatures in Kustavi, Finland

The warmest months in Kustavi are June, July and August, with daily mean temperatures ranging from 14 to 17 °C (58 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -2 to 0 °C (29 - 33 °F) throughout the day. On average each year, Kustavi experiences 0 days above 25 °C (77.0 °F) and 67 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Kustavi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum7°C
(45°F)		6°C
(43°F)		8°C
(46°F)		13°C
(55°F)		18°C
(64°F)		24°C
(75°F)		26°C
(80°F)		24°C
(76°F)		21°C
(69°F)		15°C
(60°F)		13°C
(55°F)		7°C
(44°F)
Mean maximum5°C
(42°F)		4°C
(39°F)		6°C
(42°F)		9°C
(48°F)		15°C
(60°F)		19°C
(66°F)		24°C
(75°F)		21°C
(70°F)		18°C
(65°F)		14°C
(57°F)		10°C
(51°F)		6°C
(44°F)
Average high1°C
(35°F)		-0°C
(32°F)		2°C
(35°F)		5°C
(41°F)		9°C
(49°F)		16°C
(60°F)		19°C
(66°F)		18°C
(65°F)		15°C
(59°F)		10°C
(50°F)		6°C
(44°F)		3°C
(37°F)
Daily mean0°C
(32°F)		-2°C
(29°F)		0°C
(33°F)		3°C
(38°F)		8°C
(47°F)		14°C
(58°F)		17°C
(63°F)		17°C
(63°F)		13°C
(56°F)		9°C
(48°F)		5°C
(42°F)		2°C
(36°F)
Average low-1°C
(30°F)		-3°C
(26°F)		-1°C
(30°F)		2°C
(36°F)		6°C
(44°F)		13°C
(55°F)		16°C
(60°F)		16°C
(61°F)		12°C
(54°F)		8°C
(46°F)		4°C
(40°F)		1°C
(34°F)
Mean minimum-8°C
(17°F)		-10°C
(14°F)		-8°C
(18°F)		-2°C
(29°F)		1°C
(35°F)		9°C
(48°F)		12°C
(54°F)		12°C
(54°F)		8°C
(46°F)		2°C
(35°F)		-2°C
(29°F)		-5°C
(24°F)
Minimum-13°C
(9°F)		-15°C
(5°F)		-16°C
(3°F)		-4°C
(26°F)		1°C
(33°F)		6°C
(43°F)		11°C
(51°F)		10°C
(51°F)		6°C
(43°F)		-0°C
(31°F)		-5°C
(23°F)		-13°C
(9°F)

Compare climate in Kustavi with other places

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

Monthly average precipitation in Kustavi, Finland

Kustavi usually has the most precipitation in September, October and December, with an average of 16 rainy days and 91 mm (3.6 inches) of precipitation per month. The driest months in Kustavi are April, May and June. On average, 33 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Kustavi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)46 (1.8)40 (1.6)40 (1.6)27 (1.1)37 (1.5)36 (1.4)47 (1.9)67 (2.6)77 (3.0)107 (4.2)69 (2.7)87 (3.4)
Average precipitation days (≥ 1 mm)109876591212191417

Monthly sunshine hours in Kustavi, Finland

The sunniest months in Kustavi are May, June and July, when the sun shines an average of 15 hours 50 minutes a day. Least sunny months in Kustavi: January, November and December receive an average of 2 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Kustavi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours6516527937646449549742832221713273
Mean daily daylight hours6h 39m9h 4m11h 51m14h 41m17h 20m18h 53m18h 3m15h 35m12h 48m10h 0m7h 22m5h 49m

Solar UV radiation in Kustavi, Finland

Kustavi 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 Kustavi UV Index data.

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