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Monthly climate in Seydisfjoerdur, Iceland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Seydisfjoerdur features a ice cap climate ET). Temperatures typically range between -3 °C (28 °F) and 10 °C (51 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 22 °C (72 °F). The average annual precipitation amounts to about 1481 mm (58.3 inches) and receives 201 rainy days on the 1 mm (0.04 inches) threshold annually. Seydisfjoerdur enjoys an average of 2132 hours of sunshine throughout the year, and daylight varies from 3 hours 38 minutes to 21 hours 54 minutes per day.

Monthly average temperatures in Seydisfjoerdur, Iceland

The warmest months in Seydisfjoerdur are June, July and August, with daily mean temperatures ranging from 8 to 10 °C (47 - 51 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -2 °C (28 - 29 °F) throughout the day. On average each year, Seydisfjoerdur experiences 0 days above 25 °C (77.0 °F) and 166 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seydisfjoerdur. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		8°C
(46°F)		11°C
(51°F)		11°C
(53°F)		17°C
(63°F)		22°C
(71°F)		22°C
(72°F)		21°C
(71°F)		19°C
(67°F)		10°C
(51°F)		10°C
(50°F)		9°C
(49°F)
Mean maximum7°C
(45°F)		7°C
(44°F)		7°C
(45°F)		9°C
(48°F)		14°C
(57°F)		17°C
(63°F)		18°C
(66°F)		18°C
(64°F)		16°C
(60°F)		9°C
(49°F)		8°C
(46°F)		7°C
(46°F)
Average high0°C
(33°F)		0°C
(33°F)		1°C
(35°F)		3°C
(38°F)		6°C
(43°F)		10°C
(51°F)		13°C
(55°F)		12°C
(54°F)		10°C
(50°F)		5°C
(41°F)		1°C
(35°F)		0°C
(32°F)
Daily mean-3°C
(28°F)		-2°C
(29°F)		-1°C
(31°F)		1°C
(34°F)		4°C
(39°F)		8°C
(47°F)		10°C
(51°F)		9°C
(49°F)		7°C
(45°F)		3°C
(37°F)		-1°C
(31°F)		-2°C
(28°F)
Average low-5°C
(23°F)		-5°C
(24°F)		-4°C
(26°F)		-2°C
(29°F)		1°C
(34°F)		5°C
(41°F)		8°C
(46°F)		7°C
(45°F)		5°C
(41°F)		0°C
(33°F)		-3°C
(26°F)		-5°C
(23°F)
Mean minimum-15°C
(6°F)		-13°C
(8°F)		-10°C
(14°F)		-10°C
(14°F)		-4°C
(25°F)		1°C
(34°F)		5°C
(40°F)		3°C
(38°F)		-1°C
(31°F)		-7°C
(21°F)		-11°C
(12°F)		-17°C
(2°F)
Minimum-20°C
(-4°F)		-18°C
(-0°F)		-12°C
(11°F)		-12°C
(10°F)		-9°C
(16°F)		-1°C
(30°F)		2°C
(36°F)		0°C
(33°F)		-3°C
(27°F)		-12°C
(10°F)		-13°C
(8°F)		-18°C
(-0°F)

Compare climate in Seydisfjoerdur with other places

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

Monthly average precipitation in Seydisfjoerdur, Iceland

Seydisfjoerdur usually has the most precipitation in February, October and December, with an average of 19 rainy days and 186 mm (7.3 inches) of precipitation per month. The driest months in Seydisfjoerdur are April, July and August. On average, 76 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seydisfjoerdur. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)118 (4.6)176 (6.9)142 (5.6)78 (3.1)79 (3.1)97 (3.8)71 (2.8)78 (3.1)128 (5.0)186 (7.3)132 (5.2)194 (7.7)
Average precipitation days (≥ 1 mm)151918131615141419211819

Monthly sunshine hours in Seydisfjoerdur, Iceland

The sunniest months in Seydisfjoerdur are May, June and July, when the sun shines an average of 9 hours 57 minutes a day. Least sunny months in Seydisfjoerdur: January, November and December receive an average of 1 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seydisfjoerdur. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours30881922552933043182671951116113
Mean daily daylight hours5h 1m8h 21m11h 49m15h 20m18h 59m21h 54m20h 9m16h 29m12h 58m9h 31m6h 3m3h 38m

Solar UV radiation in Seydisfjoerdur, Iceland

Seydisfjoerdur experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 Seydisfjoerdur UV Index data.

Average daily maximum UV levels by month for Seydisfjoerdur. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)112456543211