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Monthly climate in Castletownbere, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castletownbere features a oceanic climate (Cfb). Temperatures typically range between 7 °C (45 °F) and 15 °C (60 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 26 °C (79 °F). The average annual precipitation amounts to about 1600 mm (63.0 inches) and receives 210 rainy days on the 1 mm (0.04 inches) threshold annually. Castletownbere enjoys an average of 2989 hours of sunshine throughout the year, and daylight varies from 7 hours 52 minutes to 16 hours 33 minutes per day.

Monthly average temperatures in Castletownbere, Ireland

The warmest months in Castletownbere are July, August and September, with daily mean temperatures ranging from 14 to 15 °C (57 - 60 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 7 to 8 °C (45 - 46 °F) throughout the day. On average each year, Castletownbere experiences 0 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castletownbere. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		13°C
(55°F)		16°C
(61°F)		16°C
(62°F)		20°C
(69°F)		26°C
(79°F)		26°C
(79°F)		21°C
(70°F)		25°C
(77°F)		17°C
(62°F)		14°C
(58°F)		13°C
(56°F)
Mean maximum12°C
(54°F)		12°C
(54°F)		13°C
(56°F)		15°C
(59°F)		18°C
(65°F)		21°C
(70°F)		22°C
(72°F)		19°C
(67°F)		20°C
(68°F)		16°C
(61°F)		14°C
(57°F)		13°C
(55°F)
Average high9°C
(49°F)		9°C
(49°F)		10°C
(50°F)		12°C
(53°F)		14°C
(57°F)		16°C
(61°F)		18°C
(64°F)		17°C
(62°F)		16°C
(61°F)		13°C
(56°F)		11°C
(52°F)		10°C
(50°F)
Daily mean7°C
(45°F)		8°C
(46°F)		7°C
(46°F)		9°C
(49°F)		11°C
(53°F)		14°C
(57°F)		15°C
(60°F)		15°C
(59°F)		14°C
(57°F)		11°C
(53°F)		9°C
(49°F)		8°C
(47°F)
Average low5°C
(42°F)		6°C
(42°F)		5°C
(42°F)		7°C
(44°F)		9°C
(48°F)		11°C
(52°F)		13°C
(56°F)		13°C
(56°F)		12°C
(53°F)		9°C
(49°F)		7°C
(45°F)		7°C
(44°F)
Mean minimum0°C
(33°F)		1°C
(34°F)		0°C
(33°F)		2°C
(36°F)		5°C
(41°F)		8°C
(47°F)		10°C
(50°F)		10°C
(50°F)		7°C
(45°F)		5°C
(42°F)		2°C
(36°F)		2°C
(36°F)
Minimum-2°C
(28°F)		-1°C
(30°F)		-5°C
(24°F)		1°C
(34°F)		3°C
(38°F)		7°C
(45°F)		9°C
(49°F)		9°C
(48°F)		5°C
(42°F)		3°C
(37°F)		1°C
(35°F)		1°C
(33°F)

Compare climate in Castletownbere with other places

Compare temperature, precipitation, sunshine, UV index in Castletownbere, Ireland with other places around the world.

Monthly average precipitation in Castletownbere, Ireland

Castletownbere usually has the most precipitation in February, October and December, with an average of 20 rainy days and 192 mm (7.5 inches) of precipitation per month. The driest months in Castletownbere are April, June and July. On average, 86 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castletownbere. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)117 (4.6)187 (7.4)140 (5.5)83 (3.3)93 (3.7)88 (3.5)88 (3.4)139 (5.5)121 (4.8)187 (7.4)156 (6.1)201 (7.9)
Average precipitation days (≥ 1 mm)152019121517152118191821

Monthly sunshine hours in Castletownbere, Ireland

The sunniest months in Castletownbere are May, June and July, when the sun shines an average of 12 hours 28 minutes a day. Least sunny months in Castletownbere: January, November and December receive an average of 3 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castletownbere. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours8113619632138737738335229722513495
Mean daily daylight hours8h 23m9h 58m11h 55m13h 54m15h 39m16h 33m16h 4m14h 30m12h 35m10h 36m8h 49m7h 52m

Solar UV radiation in Castletownbere, Ireland

Castletownbere experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Castletownbere UV Index data.

Average daily maximum UV levels by month for Castletownbere. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124678875421