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Monthly climate in Slane, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Slane features a oceanic climate (Cfb). Temperatures typically range between 6 °C (43 °F) and 16 °C (62 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 28 °C (83 °F). The average annual precipitation amounts to about 879 mm (34.6 inches) and receives 157 rainy days on the 1 mm (0.04 inches) threshold annually. Slane enjoys an average of 2914 hours of sunshine throughout the year, and daylight varies from 7 hours 31 minutes to 16 hours 57 minutes per day.

Monthly average temperatures in Slane, Ireland

The warmest months in Slane are June, July and August, with daily mean temperatures ranging from 15 to 16 °C (59 - 62 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 6 °C (43 - 44 °F) throughout the day. On average each year, Slane experiences 2 days above 25 °C (77.0 °F) and 10 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Slane. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		15°C
(60°F)		17°C
(63°F)		20°C
(69°F)		24°C
(75°F)		28°C
(83°F)		28°C
(83°F)		23°C
(73°F)		23°C
(73°F)		20°C
(68°F)		15°C
(60°F)		13°C
(56°F)
Mean maximum12°C
(55°F)		13°C
(56°F)		15°C
(60°F)		18°C
(65°F)		21°C
(70°F)		23°C
(73°F)		25°C
(77°F)		22°C
(73°F)		21°C
(70°F)		18°C
(64°F)		14°C
(58°F)		13°C
(55°F)
Average high8°C
(47°F)		9°C
(48°F)		10°C
(51°F)		12°C
(54°F)		15°C
(60°F)		18°C
(65°F)		20°C
(68°F)		19°C
(66°F)		17°C
(63°F)		13°C
(57°F)		10°C
(51°F)		8°C
(48°F)
Daily mean6°C
(43°F)		6°C
(44°F)		7°C
(45°F)		9°C
(48°F)		12°C
(53°F)		15°C
(59°F)		16°C
(62°F)		16°C
(60°F)		14°C
(57°F)		11°C
(52°F)		8°C
(47°F)		6°C
(44°F)
Average low4°C
(39°F)		4°C
(39°F)		4°C
(40°F)		5°C
(42°F)		8°C
(47°F)		11°C
(52°F)		13°C
(55°F)		13°C
(55°F)		11°C
(51°F)		8°C
(47°F)		6°C
(42°F)		4°C
(40°F)
Mean minimum-2°C
(29°F)		-1°C
(30°F)		-0°C
(32°F)		0°C
(32°F)		2°C
(35°F)		6°C
(44°F)		9°C
(48°F)		8°C
(47°F)		5°C
(42°F)		3°C
(37°F)		0°C
(33°F)		-0°C
(32°F)
Minimum-4°C
(25°F)		-3°C
(27°F)		-4°C
(26°F)		-2°C
(28°F)		-1°C
(31°F)		5°C
(41°F)		8°C
(46°F)		7°C
(44°F)		3°C
(37°F)		1°C
(33°F)		-2°C
(28°F)		-2°C
(28°F)

Compare climate in Slane with other places

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

Monthly average precipitation in Slane, Ireland

Slane usually has the most precipitation in August, November and December, with an average of 15 rainy days and 91 mm (3.6 inches) of precipitation per month. The driest months in Slane are January, April and May. On average, 53 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Slane. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)50 (2.0)79 (3.1)76 (3.0)44 (1.8)64 (2.5)73 (2.9)73 (2.9)104 (4.1)71 (2.8)76 (3.0)83 (3.3)85 (3.4)
Average precipitation days (≥ 1 mm)91515101214131711131414

Monthly sunshine hours in Slane, Ireland

The sunniest months in Slane are May, June and July, when the sun shines an average of 12 hours 24 minutes a day. Least sunny months in Slane: January, November and December receive an average of 3 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Slane. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours8014518930838537837732928822611490
Mean daily daylight hours8h 4m9h 48m11h 54m14h 3m15h 57m16h 57m16h 25m14h 42m12h 37m10h 29m8h 33m7h 31m

Solar UV radiation in Slane, Ireland

Slane 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 Slane UV Index data.

Average daily maximum UV levels by month for Slane. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875321