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Monthly climate in Grundarfjoerdur, Iceland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Grundarfjoerdur features a ice cap climate ET). Temperatures typically range between 1 °C (34 °F) and 10 °C (51 °F) through the year, but rarely can drop to -7 °C (20 °F) or can rise to as high as 16 °C (62 °F). The average annual precipitation amounts to about 1121 mm (44.1 inches) and receives 188 rainy days on the 1 mm (0.04 inches) threshold annually. Grundarfjoerdur enjoys an average of 2120 hours of sunshine throughout the year, and daylight varies from 3 hours 52 minutes to 21 hours 31 minutes per day.

Monthly average temperatures in Grundarfjoerdur, Iceland

The warmest months in Grundarfjoerdur are July, August and September, with daily mean temperatures ranging from 8 to 10 °C (48 - 51 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 1 to 1 °C (34 - 35 °F) throughout the day. On average each year, Grundarfjoerdur experiences 0 days above 25 °C (77.0 °F) and 70 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grundarfjoerdur. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(47°F)		7°C
(45°F)		7°C
(45°F)		10°C
(51°F)		12°C
(53°F)		14°C
(58°F)		16°C
(62°F)		16°C
(60°F)		13°C
(56°F)		10°C
(50°F)		10°C
(51°F)		9°C
(48°F)
Mean maximum7°C
(45°F)		6°C
(44°F)		6°C
(44°F)		8°C
(47°F)		10°C
(51°F)		11°C
(53°F)		15°C
(59°F)		14°C
(57°F)		12°C
(54°F)		10°C
(49°F)		9°C
(48°F)		8°C
(47°F)
Average high3°C
(37°F)		2°C
(36°F)		3°C
(37°F)		5°C
(41°F)		7°C
(44°F)		9°C
(49°F)		11°C
(52°F)		11°C
(53°F)		9°C
(49°F)		7°C
(45°F)		4°C
(40°F)		3°C
(38°F)
Daily mean1°C
(34°F)		1°C
(34°F)		1°C
(35°F)		3°C
(38°F)		6°C
(42°F)		8°C
(47°F)		10°C
(51°F)		10°C
(51°F)		8°C
(48°F)		6°C
(43°F)		3°C
(38°F)		2°C
(36°F)
Average low-0°C
(31°F)		-0°C
(32°F)		0°C
(33°F)		2°C
(36°F)		4°C
(40°F)		7°C
(45°F)		9°C
(49°F)		9°C
(49°F)		7°C
(46°F)		5°C
(41°F)		2°C
(36°F)		1°C
(34°F)
Mean minimum-5°C
(24°F)		-5°C
(24°F)		-4°C
(26°F)		-4°C
(26°F)		1°C
(33°F)		4°C
(40°F)		7°C
(45°F)		7°C
(45°F)		4°C
(39°F)		1°C
(35°F)		-1°C
(30°F)		-4°C
(25°F)
Minimum-6°C
(21°F)		-7°C
(20°F)		-7°C
(20°F)		-7°C
(20°F)		-1°C
(31°F)		3°C
(38°F)		6°C
(43°F)		6°C
(43°F)		2°C
(36°F)		-1°C
(31°F)		-3°C
(27°F)		-5°C
(23°F)

Compare climate in Grundarfjoerdur with other places

Compare temperature, precipitation, sunshine, UV index in Grundarfjoerdur, Iceland with other places around the world.

Monthly average precipitation in Grundarfjoerdur, Iceland

Grundarfjoerdur usually has the most precipitation in February, April and September, with an average of 17 rainy days and 123 mm (4.8 inches) of precipitation per month. The driest months in Grundarfjoerdur are June, July and August. On average, 70 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grundarfjoerdur. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)95 (3.7)106 (4.2)90 (3.5)105 (4.1)80 (3.1)62 (2.4)74 (2.9)73 (2.9)159 (6.3)101 (4.0)87 (3.4)90 (3.6)
Average precipitation days (≥ 1 mm)161816171413141318181516

Monthly sunshine hours in Grundarfjoerdur, Iceland

The sunniest months in Grundarfjoerdur are May, June and July, when the sun shines an average of 10 hours 21 minutes a day. Least sunny months in Grundarfjoerdur: January, November and December receive an average of 1 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grundarfjoerdur. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours24811892283433112982681781245517
Mean daily daylight hours5h 10m8h 25m11h 49m15h 17m18h 50m21h 31m19h 55m16h 24m12h 57m9h 33m6h 9m3h 52m

Solar UV radiation in Grundarfjoerdur, Iceland

Grundarfjoerdur experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 5 - 5, which corresponds to the Moderate 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 Grundarfjoerdur UV Index data.

Average daily maximum UV levels by month for Grundarfjoerdur. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)112355543211