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Monthly climate in Rathnew, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rathnew features a oceanic climate (Cfb). Temperatures typically range between 6 °C (44 °F) and 15 °C (60 °F) through the year, but rarely can drop to -3 °C (26 °F) or can rise to as high as 20 °C (69 °F). The average annual precipitation amounts to about 1086 mm (42.7 inches) and receives 170 rainy days on the 1 mm (0.04 inches) threshold annually. Rathnew enjoys an average of 3123 hours of sunshine throughout the year, and daylight varies from 7 hours 38 minutes to 16 hours 49 minutes per day.

Monthly average temperatures in Rathnew, Ireland

The warmest months in Rathnew 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 6 to 7 °C (44 - 45 °F) throughout the day. On average each year, Rathnew experiences 0 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rathnew. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(55°F)		13°C
(56°F)		12°C
(54°F)		15°C
(59°F)		17°C
(63°F)		19°C
(66°F)		20°C
(68°F)		20°C
(69°F)		20°C
(68°F)		17°C
(63°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum11°C
(53°F)		11°C
(53°F)		12°C
(53°F)		13°C
(55°F)		16°C
(61°F)		17°C
(63°F)		19°C
(67°F)		19°C
(66°F)		19°C
(66°F)		16°C
(61°F)		14°C
(57°F)		12°C
(54°F)
Average high8°C
(47°F)		8°C
(47°F)		9°C
(48°F)		10°C
(50°F)		12°C
(54°F)		15°C
(59°F)		17°C
(62°F)		17°C
(62°F)		16°C
(60°F)		13°C
(56°F)		10°C
(51°F)		9°C
(48°F)
Daily mean6°C
(44°F)		7°C
(44°F)		7°C
(45°F)		8°C
(47°F)		11°C
(51°F)		13°C
(56°F)		15°C
(59°F)		15°C
(60°F)		14°C
(57°F)		12°C
(53°F)		9°C
(48°F)		7°C
(46°F)
Average low5°C
(41°F)		5°C
(41°F)		5°C
(41°F)		6°C
(44°F)		9°C
(48°F)		11°C
(53°F)		13°C
(56°F)		13°C
(57°F)		12°C
(54°F)		10°C
(50°F)		7°C
(46°F)		6°C
(43°F)
Mean minimum2°C
(36°F)		1°C
(35°F)		1°C
(35°F)		3°C
(38°F)		5°C
(41°F)		9°C
(48°F)		11°C
(52°F)		11°C
(52°F)		8°C
(47°F)		6°C
(44°F)		4°C
(39°F)		3°C
(37°F)
Minimum0°C
(33°F)		0°C
(33°F)		-3°C
(26°F)		1°C
(35°F)		3°C
(38°F)		8°C
(46°F)		10°C
(50°F)		10°C
(50°F)		7°C
(44°F)		4°C
(40°F)		2°C
(37°F)		1°C
(34°F)

Compare climate in Rathnew with other places

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

Monthly average precipitation in Rathnew, Ireland

Rathnew usually has the most precipitation in October, November and December, with an average of 16 rainy days and 122 mm (4.8 inches) of precipitation per month. The driest months in Rathnew are January, April and May. On average, 63 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rathnew. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)71 (2.8)98 (3.9)92 (3.6)52 (2.1)67 (2.6)76 (3.0)79 (3.1)102 (4.0)84 (3.3)108 (4.3)136 (5.4)121 (4.8)
Average precipitation days (≥ 1 mm)111615111213131514161915

Monthly sunshine hours in Rathnew, Ireland

The sunniest months in Rathnew are May, June and July, when the sun shines an average of 13 hours 10 minutes a day. Least sunny months in Rathnew: January, November and December receive an average of 3 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rathnew. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours87153207328408400403360308236127101
Mean daily daylight hours8h 11m9h 51m11h 54m14h 0m15h 51m16h 49m16h 18m14h 38m12h 36m10h 31m8h 39m7h 38m

Solar UV radiation in Rathnew, Ireland

Rathnew 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 Rathnew UV Index data.

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