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Monthly climate in Castleisland, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castleisland features a oceanic climate (Cfb). Temperatures typically range between 6 °C (43 °F) and 15 °C (60 °F) through the year, but rarely can drop to -6 °C (21 °F) or can rise to as high as 28 °C (83 °F). The average annual precipitation amounts to about 1086 mm (42.8 inches) and receives 190 rainy days on the 1 mm (0.04 inches) threshold annually. Castleisland enjoys an average of 2770 hours of sunshine throughout the year, and daylight varies from 7 hours 47 minutes to 16 hours 39 minutes per day.

Monthly average temperatures in Castleisland, Ireland

The warmest months in Castleisland are June, July and August, with daily mean temperatures ranging from 13 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 6 to 7 °C (43 - 44 °F) throughout the day. On average each year, Castleisland experiences 2 days above 25 °C (77.0 °F) and 12 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castleisland. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(57°F)		14°C
(58°F)		17°C
(63°F)		20°C
(68°F)		23°C
(74°F)		28°C
(83°F)		28°C
(82°F)		23°C
(73°F)		26°C
(79°F)		18°C
(64°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum12°C
(54°F)		12°C
(55°F)		15°C
(59°F)		17°C
(63°F)		21°C
(70°F)		22°C
(72°F)		24°C
(75°F)		21°C
(71°F)		22°C
(71°F)		16°C
(62°F)		14°C
(58°F)		13°C
(55°F)
Average high8°C
(47°F)		9°C
(48°F)		10°C
(50°F)		12°C
(54°F)		15°C
(58°F)		17°C
(62°F)		18°C
(65°F)		18°C
(64°F)		16°C
(61°F)		13°C
(56°F)		10°C
(51°F)		9°C
(49°F)
Daily mean6°C
(43°F)		7°C
(44°F)		7°C
(44°F)		9°C
(48°F)		11°C
(52°F)		13°C
(57°F)		15°C
(60°F)		15°C
(59°F)		13°C
(56°F)		10°C
(51°F)		8°C
(47°F)		7°C
(45°F)
Average low4°C
(39°F)		4°C
(39°F)		4°C
(39°F)		5°C
(42°F)		8°C
(46°F)		10°C
(50°F)		12°C
(54°F)		12°C
(54°F)		10°C
(51°F)		8°C
(46°F)		6°C
(42°F)		5°C
(41°F)
Mean minimum-2°C
(28°F)		-1°C
(30°F)		-1°C
(30°F)		-1°C
(31°F)		2°C
(36°F)		6°C
(42°F)		8°C
(47°F)		8°C
(46°F)		5°C
(41°F)		3°C
(37°F)		-0°C
(32°F)		0°C
(33°F)
Minimum-5°C
(24°F)		-3°C
(27°F)		-6°C
(21°F)		-2°C
(29°F)		-1°C
(31°F)		5°C
(41°F)		6°C
(44°F)		6°C
(43°F)		2°C
(36°F)		-0°C
(32°F)		-1°C
(30°F)		-1°C
(30°F)

Compare climate in Castleisland with other places

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

Monthly average precipitation in Castleisland, Ireland

Castleisland usually has the most precipitation in February, August and December, with an average of 18 rainy days and 119 mm (4.7 inches) of precipitation per month. The driest months in Castleisland are April, June and July. On average, 66 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castleisland. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)74 (2.9)118 (4.6)104 (4.1)65 (2.6)69 (2.7)64 (2.5)68 (2.7)114 (4.5)80 (3.2)109 (4.3)96 (3.8)126 (5.0)
Average precipitation days (≥ 1 mm)131818131315131816171719

Monthly sunshine hours in Castleisland, Ireland

The sunniest months in Castleisland are May, June and July, when the sun shines an average of 11 hours 47 minutes a day. Least sunny months in Castleisland: January, November and December receive an average of 3 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castleisland. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours7612717629138035135332127121611490
Mean daily daylight hours8h 18m9h 55m11h 54m13h 57m15h 43m16h 39m16h 9m14h 33m12h 35m10h 34m8h 45m7h 47m

Solar UV radiation in Castleisland, Ireland

Castleisland 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 Castleisland UV Index data.

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