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Monthly climate in Porsgrunn, Norway

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Porsgrunn features a humid continental climate (Dfb). Temperatures typically range between -1 °C (30 °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 30 °C (87 °F). The average annual precipitation amounts to about 1161 mm (45.7 inches) and receives 141 rainy days on the 1 mm (0.04 inches) threshold annually. Porsgrunn enjoys an average of 3435 hours of sunshine throughout the year, and daylight varies from 6 hours 15 minutes to 18 hours 23 minutes per day.

Monthly average temperatures in Porsgrunn, Norway

The warmest months in Porsgrunn are June, July and August, with daily mean temperatures ranging from 16 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 -1 to -1 °C (30 - 31 °F) throughout the day. On average each year, Porsgrunn experiences 9 days above 25 °C (77.0 °F) and 113 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Porsgrunn. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum10°C
(51°F)		11°C
(53°F)		15°C
(60°F)		21°C
(70°F)		27°C
(82°F)		28°C
(83°F)		30°C
(87°F)		26°C
(80°F)		24°C
(76°F)		18°C
(64°F)		15°C
(59°F)		10°C
(50°F)
Mean maximum7°C
(46°F)		8°C
(46°F)		13°C
(55°F)		17°C
(64°F)		23°C
(74°F)		24°C
(76°F)		27°C
(80°F)		25°C
(77°F)		21°C
(70°F)		15°C
(59°F)		12°C
(54°F)		8°C
(46°F)
Average high1°C
(34°F)		2°C
(35°F)		5°C
(42°F)		10°C
(50°F)		15°C
(59°F)		20°C
(68°F)		21°C
(71°F)		20°C
(67°F)		16°C
(61°F)		10°C
(51°F)		5°C
(42°F)		1°C
(35°F)
Daily mean-1°C
(30°F)		-1°C
(30°F)		1°C
(35°F)		5°C
(42°F)		10°C
(51°F)		16°C
(60°F)		17°C
(63°F)		16°C
(60°F)		12°C
(54°F)		7°C
(46°F)		3°C
(38°F)		-1°C
(31°F)
Average low-4°C
(25°F)		-4°C
(25°F)		-2°C
(28°F)		1°C
(33°F)		6°C
(42°F)		11°C
(52°F)		12°C
(55°F)		12°C
(53°F)		9°C
(49°F)		5°C
(41°F)		1°C
(34°F)		-3°C
(28°F)
Mean minimum-12°C
(11°F)		-12°C
(11°F)		-10°C
(14°F)		-6°C
(22°F)		-1°C
(30°F)		7°C
(44°F)		8°C
(47°F)		7°C
(44°F)		4°C
(40°F)		-2°C
(28°F)		-6°C
(21°F)		-9°C
(15°F)
Minimum-14°C
(6°F)		-16°C
(3°F)		-16°C
(4°F)		-11°C
(13°F)		-4°C
(25°F)		4°C
(40°F)		7°C
(44°F)		5°C
(42°F)		1°C
(35°F)		-4°C
(26°F)		-10°C
(14°F)		-12°C
(11°F)

Compare climate in Porsgrunn with other places

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

Monthly average precipitation in Porsgrunn, Norway

Porsgrunn usually has the most precipitation in September, October and December, with an average of 14 rainy days and 131 mm (5.2 inches) of precipitation per month. The driest months in Porsgrunn are January, March and April. On average, 65 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Porsgrunn. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)76 (3.0)79 (3.1)79 (3.1)39 (1.5)86 (3.4)94 (3.7)104 (4.1)94 (3.7)126 (5.0)137 (5.4)116 (4.6)130 (5.1)
Average precipitation days (≥ 1 mm)911961112121313151416

Monthly sunshine hours in Porsgrunn, Norway

The sunniest months in Porsgrunn are May, June and July, when the sun shines an average of 14 hours 39 minutes a day. Least sunny months in Porsgrunn: January, November and December receive an average of 3 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Porsgrunn. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours9518028736842045647240728323213298
Mean daily daylight hours7h 0m9h 15m11h 52m14h 32m16h 59m18h 23m17h 38m15h 22m12h 45m10h 7m7h 39m6h 15m

Solar UV radiation in Porsgrunn, Norway

Porsgrunn 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 Porsgrunn UV Index data.

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