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Monthly climate in Slemmestad, Norway

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Slemmestad features a humid continental climate (Dfb). Temperatures typically range between -2 °C (28 °F) and 18 °C (65 °F) through the year, but rarely can drop to -19 °C (-1 °F) or can rise to as high as 33 °C (91 °F). The average annual precipitation amounts to about 1019 mm (40.1 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually. Slemmestad enjoys an average of 3415 hours of sunshine throughout the year, and daylight varies from 6 hours 3 minutes to 18 hours 37 minutes per day.

Monthly average temperatures in Slemmestad, Norway

The warmest months in Slemmestad are June, July and August, with daily mean temperatures ranging from 16 to 18 °C (62 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to -1 °C (28 - 30 °F) throughout the day. On average each year, Slemmestad experiences 17 days above 25 °C (77.0 °F) and 112 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Slemmestad. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum9°C
(49°F)		9°C
(48°F)		19°C
(67°F)		23°C
(74°F)		30°C
(87°F)		30°C
(87°F)		33°C
(91°F)		28°C
(83°F)		25°C
(78°F)		17°C
(63°F)		14°C
(58°F)		8°C
(47°F)
Mean maximum7°C
(44°F)		7°C
(45°F)		14°C
(58°F)		19°C
(67°F)		24°C
(76°F)		25°C
(78°F)		28°C
(83°F)		26°C
(79°F)		22°C
(72°F)		15°C
(59°F)		11°C
(52°F)		7°C
(45°F)
Average high0°C
(33°F)		1°C
(34°F)		5°C
(42°F)		11°C
(52°F)		15°C
(60°F)		21°C
(70°F)		23°C
(73°F)		20°C
(69°F)		16°C
(61°F)		10°C
(51°F)		5°C
(41°F)		1°C
(33°F)
Daily mean-2°C
(28°F)		-2°C
(29°F)		1°C
(34°F)		6°C
(43°F)		11°C
(52°F)		16°C
(62°F)		18°C
(65°F)		16°C
(62°F)		13°C
(55°F)		8°C
(46°F)		3°C
(38°F)		-1°C
(30°F)
Average low-5°C
(24°F)		-5°C
(24°F)		-3°C
(27°F)		1°C
(34°F)		6°C
(43°F)		12°C
(53°F)		13°C
(57°F)		13°C
(55°F)		10°C
(50°F)		5°C
(42°F)		1°C
(34°F)		-3°C
(27°F)
Mean minimum-13°C
(8°F)		-14°C
(8°F)		-9°C
(16°F)		-5°C
(23°F)		-0°C
(32°F)		7°C
(45°F)		10°C
(50°F)		8°C
(46°F)		5°C
(41°F)		-1°C
(31°F)		-6°C
(21°F)		-10°C
(14°F)
Minimum-18°C
(-1°F)		-19°C
(-1°F)		-16°C
(3°F)		-12°C
(11°F)		-1°C
(30°F)		6°C
(42°F)		8°C
(48°F)		6°C
(43°F)		1°C
(35°F)		-3°C
(27°F)		-8°C
(18°F)		-14°C
(6°F)

Compare climate in Slemmestad with other places

Compare temperature, precipitation, sunshine, UV index in Slemmestad, Norway with other places around the world.

Monthly average precipitation in Slemmestad, Norway

Slemmestad usually has the most precipitation in September, October and December, with an average of 14 rainy days and 114 mm (4.5 inches) of precipitation per month. The driest months in Slemmestad are January, February and April. On average, 54 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Slemmestad. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)60 (2.4)66 (2.6)66 (2.6)36 (1.4)81 (3.2)84 (3.3)93 (3.7)87 (3.4)106 (4.2)128 (5.0)103 (4.1)107 (4.2)
Average precipitation days (≥ 1 mm)910951112111312151316

Monthly sunshine hours in Slemmestad, Norway

The sunniest months in Slemmestad are May, June and July, when the sun shines an average of 14 hours 36 minutes a day. Least sunny months in Slemmestad: January, November and December receive an average of 3 hours 31 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Slemmestad. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours9217928837041845447140228022513299
Mean daily daylight hours6h 51m9h 10m11h 51m14h 36m17h 9m18h 37m17h 49m15h 27m12h 47m10h 4m7h 31m6h 3m

Solar UV radiation in Slemmestad, Norway

Slemmestad 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, November and December 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 Slemmestad UV Index data.

Average daily maximum UV levels by month for Slemmestad. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)123457754211