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Monthly climate in Rantasalmi, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rantasalmi features a subarctic climate (Dfc). Temperatures typically range between -6 °C (21 °F) and 17 °C (63 °F) through the year, but rarely can drop to -28 °C (-17 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 746 mm (29.4 inches) and receives 149 rainy days on the 1 mm (0.04 inches) threshold annually. Rantasalmi enjoys an average of 3026 hours of sunshine throughout the year, and daylight varies from 5 hours 16 minutes to 19 hours 33 minutes per day.

Monthly average temperatures in Rantasalmi, Finland

The warmest months in Rantasalmi are June, July and August, with daily mean temperatures ranging from 15 to 17 °C (60 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -4 °C (21 - 26 °F) throughout the day. On average each year, Rantasalmi experiences 10 days above 25 °C (77.0 °F) and 148 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rantasalmi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum7°C
(44°F)		6°C
(42°F)		11°C
(52°F)		17°C
(64°F)		27°C
(80°F)		32°C
(89°F)		31°C
(88°F)		30°C
(85°F)		22°C
(73°F)		18°C
(65°F)		10°C
(51°F)		4°C
(39°F)
Mean maximum3°C
(38°F)		3°C
(38°F)		8°C
(46°F)		13°C
(55°F)		23°C
(73°F)		26°C
(79°F)		28°C
(83°F)		25°C
(77°F)		19°C
(67°F)		14°C
(57°F)		8°C
(47°F)		3°C
(37°F)
Average high-3°C
(26°F)		-4°C
(25°F)		1°C
(33°F)		6°C
(43°F)		13°C
(57°F)		20°C
(68°F)		21°C
(70°F)		19°C
(66°F)		13°C
(56°F)		7°C
(45°F)		2°C
(37°F)		-2°C
(28°F)
Daily mean-6°C
(22°F)		-6°C
(21°F)		-3°C
(27°F)		2°C
(36°F)		10°C
(49°F)		16°C
(61°F)		17°C
(63°F)		15°C
(60°F)		10°C
(51°F)		5°C
(42°F)		1°C
(34°F)		-4°C
(26°F)
Average low-8°C
(18°F)		-9°C
(16°F)		-6°C
(21°F)		-2°C
(30°F)		5°C
(42°F)		12°C
(53°F)		13°C
(56°F)		12°C
(54°F)		7°C
(46°F)		3°C
(38°F)		-1°C
(31°F)		-5°C
(23°F)
Mean minimum-22°C
(-8°F)		-20°C
(-4°F)		-18°C
(0°F)		-9°C
(17°F)		-2°C
(29°F)		6°C
(42°F)		8°C
(46°F)		8°C
(46°F)		1°C
(34°F)		-4°C
(25°F)		-9°C
(16°F)		-13°C
(9°F)
Minimum-28°C
(-17°F)		-27°C
(-16°F)		-25°C
(-12°F)		-12°C
(10°F)		-4°C
(25°F)		1°C
(34°F)		7°C
(44°F)		7°C
(45°F)		-1°C
(30°F)		-6°C
(22°F)		-14°C
(7°F)		-23°C
(-9°F)

Compare climate in Rantasalmi with other places

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

Monthly average precipitation in Rantasalmi, Finland

Rantasalmi usually has the most precipitation in July, August and September, with an average of 13 rainy days and 78 mm (3.1 inches) of precipitation per month. The driest months in Rantasalmi are February, March and April. On average, 45 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rantasalmi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)49 (1.9)44 (1.7)46 (1.8)46 (1.8)55 (2.2)67 (2.6)77 (3.0)81 (3.2)77 (3.0)76 (3.0)57 (2.2)70 (2.8)
Average precipitation days (≥ 1 mm)121112111111121414141215

Monthly sunshine hours in Rantasalmi, Finland

The sunniest months in Rantasalmi are May, June and July, when the sun shines an average of 15 hours 3 minutes a day. Least sunny months in Rantasalmi: January, November and December receive an average of 1 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rantasalmi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours341322403444224874753822591596225
Mean daily daylight hours6h 13m8h 52m11h 50m14h 52m17h 46m19h 33m18h 34m15h 50m12h 51m9h 52m7h 1m5h 16m

Solar UV radiation in Rantasalmi, Finland

Rantasalmi 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 Rantasalmi UV Index data.

Average daily maximum UV levels by month for Rantasalmi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)113456753211