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Monthly climate in Castlemartyr, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castlemartyr features a oceanic climate (Cfb). Temperatures typically range between 7 °C (44 °F) and 16 °C (61 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 24 °C (76 °F). The average annual precipitation amounts to about 1126 mm (44.3 inches) and receives 166 rainy days on the 1 mm (0.04 inches) threshold annually. Castlemartyr enjoys an average of 3022 hours of sunshine throughout the year, and daylight varies from 7 hours 49 minutes to 16 hours 37 minutes per day.

Monthly average temperatures in Castlemartyr, Ireland

The warmest months in Castlemartyr are June, July and August, with daily mean temperatures ranging from 14 to 16 °C (57 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 7 to 7 °C (44 - 45 °F) throughout the day. On average each year, Castlemartyr experiences 0 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castlemartyr. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		13°C
(56°F)		14°C
(58°F)		16°C
(62°F)		21°C
(69°F)		24°C
(75°F)		24°C
(76°F)		23°C
(74°F)		22°C
(72°F)		17°C
(63°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum12°C
(54°F)		12°C
(54°F)		13°C
(55°F)		15°C
(59°F)		18°C
(65°F)		20°C
(69°F)		22°C
(72°F)		21°C
(69°F)		19°C
(67°F)		16°C
(62°F)		14°C
(57°F)		13°C
(55°F)
Average high8°C
(48°F)		9°C
(48°F)		10°C
(49°F)		11°C
(52°F)		14°C
(57°F)		16°C
(62°F)		19°C
(66°F)		18°C
(64°F)		16°C
(61°F)		13°C
(56°F)		10°C
(51°F)		9°C
(49°F)
Daily mean7°C
(44°F)		7°C
(45°F)		7°C
(45°F)		9°C
(48°F)		11°C
(52°F)		14°C
(57°F)		16°C
(61°F)		15°C
(60°F)		14°C
(57°F)		11°C
(53°F)		9°C
(48°F)		8°C
(46°F)
Average low5°C
(41°F)		5°C
(41°F)		5°C
(40°F)		6°C
(43°F)		8°C
(47°F)		11°C
(52°F)		13°C
(56°F)		13°C
(56°F)		11°C
(53°F)		9°C
(49°F)		7°C
(44°F)		6°C
(43°F)
Mean minimum0°C
(33°F)		1°C
(33°F)		0°C
(33°F)		1°C
(34°F)		4°C
(39°F)		7°C
(46°F)		9°C
(49°F)		9°C
(49°F)		6°C
(43°F)		4°C
(40°F)		2°C
(35°F)		1°C
(34°F)
Minimum-3°C
(27°F)		-1°C
(31°F)		-5°C
(24°F)		-0°C
(32°F)		2°C
(36°F)		6°C
(44°F)		8°C
(47°F)		7°C
(45°F)		4°C
(40°F)		2°C
(36°F)		1°C
(34°F)		-1°C
(31°F)

Compare climate in Castlemartyr with other places

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

Monthly average precipitation in Castlemartyr, Ireland

Castlemartyr usually has the most precipitation in February, October and December, with an average of 16 rainy days and 124 mm (4.9 inches) of precipitation per month. The driest months in Castlemartyr are January, June and July. On average, 68 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castlemartyr. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)68 (2.7)124 (4.9)97 (3.8)80 (3.2)75 (3.0)67 (2.6)70 (2.8)103 (4.1)77 (3.0)121 (4.7)115 (4.5)129 (5.1)
Average precipitation days (≥ 1 mm)111716111211121413161617

Monthly sunshine hours in Castlemartyr, Ireland

The sunniest months in Castlemartyr are May, June and July, when the sun shines an average of 12 hours 44 minutes a day. Least sunny months in Castlemartyr: January, November and December receive an average of 3 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castlemartyr. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours89139197306391385395352297235128102
Mean daily daylight hours8h 20m9h 56m11h 55m13h 56m15h 41m16h 37m16h 7m14h 32m12h 35m10h 35m8h 47m7h 49m

Solar UV radiation in Castlemartyr, Ireland

Castlemartyr 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 Castlemartyr UV Index data.

Average daily maximum UV levels by month for Castlemartyr. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875421