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Monthly climate in Harjavalta, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Harjavalta features a humid continental climate (Dfb). Temperatures typically range between -4 °C (25 °F) and 18 °C (64 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 713 mm (28.1 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually. Harjavalta enjoys an average of 3290 hours of sunshine throughout the year, and daylight varies from 5 hours 34 minutes to 19 hours 11 minutes per day.

Monthly average temperatures in Harjavalta, Finland

The warmest months in Harjavalta are June, July and August, with daily mean temperatures ranging from 16 to 18 °C (61 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (25 - 30 °F) throughout the day. On average each year, Harjavalta experiences 15 days above 25 °C (77.0 °F) and 129 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Harjavalta. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		7°C
(46°F)		12°C
(54°F)		22°C
(72°F)		28°C
(83°F)		32°C
(90°F)		32°C
(90°F)		30°C
(87°F)		24°C
(76°F)		19°C
(66°F)		13°C
(56°F)		6°C
(44°F)
Mean maximum5°C
(41°F)		5°C
(41°F)		10°C
(51°F)		17°C
(63°F)		24°C
(76°F)		27°C
(80°F)		28°C
(83°F)		26°C
(79°F)		22°C
(71°F)		15°C
(60°F)		10°C
(51°F)		6°C
(42°F)
Average high-1°C
(31°F)		-1°C
(30°F)		3°C
(38°F)		9°C
(48°F)		15°C
(59°F)		21°C
(69°F)		22°C
(71°F)		20°C
(68°F)		15°C
(59°F)		9°C
(48°F)		4°C
(40°F)		0°C
(33°F)
Daily mean-3°C
(27°F)		-4°C
(25°F)		-1°C
(31°F)		4°C
(40°F)		10°C
(50°F)		16°C
(61°F)		18°C
(64°F)		16°C
(61°F)		11°C
(53°F)		6°C
(44°F)		3°C
(37°F)		-1°C
(30°F)
Average low-5°C
(23°F)		-7°C
(20°F)		-4°C
(24°F)		-0°C
(32°F)		4°C
(40°F)		11°C
(51°F)		13°C
(55°F)		12°C
(53°F)		8°C
(47°F)		4°C
(39°F)		1°C
(34°F)		-3°C
(27°F)
Mean minimum-18°C
(-0°F)		-18°C
(0°F)		-15°C
(4°F)		-7°C
(19°F)		-2°C
(28°F)		6°C
(42°F)		8°C
(46°F)		6°C
(42°F)		1°C
(34°F)		-5°C
(24°F)		-7°C
(20°F)		-10°C
(14°F)
Minimum-25°C
(-13°F)		-24°C
(-11°F)		-25°C
(-12°F)		-12°C
(11°F)		-4°C
(25°F)		2°C
(36°F)		6°C
(43°F)		4°C
(39°F)		-1°C
(30°F)		-7°C
(19°F)		-10°C
(14°F)		-19°C
(-3°F)

Compare climate in Harjavalta with other places

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

Monthly average precipitation in Harjavalta, Finland

Harjavalta usually has the most precipitation in July, August and October, with an average of 13 rainy days and 87 mm (3.4 inches) of precipitation per month. The driest months in Harjavalta are January, February and April. On average, 40 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Harjavalta. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)43 (1.7)40 (1.6)43 (1.7)38 (1.5)47 (1.9)57 (2.3)90 (3.5)96 (3.8)65 (2.6)75 (2.9)55 (2.2)64 (2.5)
Average precipitation days (≥ 1 mm)107101091011141214912

Monthly sunshine hours in Harjavalta, Finland

The sunniest months in Harjavalta are May, June and July, when the sun shines an average of 15 hours 25 minutes a day. Least sunny months in Harjavalta: January, November and December receive an average of 2 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Harjavalta. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours5115526235044949047941128818510561
Mean daily daylight hours6h 27m8h 59m11h 51m14h 46m17h 31m19h 11m18h 17m15h 42m12h 50m9h 57m7h 12m5h 34m

Solar UV radiation in Harjavalta, Finland

Harjavalta experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 5 - 6, 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 Harjavalta UV Index data.

Average daily maximum UV levels by month for Harjavalta. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)113456653211