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Monthly climate in Newcastle, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Newcastle features a oceanic climate (Cfb). Temperatures typically range between 5 °C (42 °F) and 16 °C (61 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 27 °C (81 °F). The average annual precipitation amounts to about 910 mm (35.8 inches) and receives 164 rainy days on the 1 mm (0.04 inches) threshold annually. Newcastle enjoys an average of 2971 hours of sunshine throughout the year, and daylight varies from 7 hours 35 minutes to 16 hours 52 minutes per day.

Monthly average temperatures in Newcastle, Ireland

The warmest months in Newcastle are June, July and August, with daily mean temperatures ranging from 14 to 16 °C (58 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (42 - 43 °F) throughout the day. On average each year, Newcastle experiences 1 days above 25 °C (77.0 °F) and 16 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Newcastle. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		16°C
(60°F)		17°C
(63°F)		21°C
(69°F)		23°C
(74°F)		27°C
(80°F)		27°C
(81°F)		24°C
(75°F)		24°C
(76°F)		19°C
(67°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum12°C
(53°F)		13°C
(56°F)		15°C
(59°F)		18°C
(64°F)		21°C
(70°F)		22°C
(72°F)		24°C
(75°F)		22°C
(72°F)		21°C
(71°F)		17°C
(63°F)		14°C
(58°F)		13°C
(55°F)
Average high8°C
(46°F)		8°C
(47°F)		10°C
(50°F)		12°C
(53°F)		15°C
(59°F)		18°C
(64°F)		19°C
(67°F)		18°C
(65°F)		17°C
(62°F)		13°C
(56°F)		10°C
(50°F)		8°C
(47°F)
Daily mean5°C
(42°F)		6°C
(43°F)		7°C
(44°F)		8°C
(47°F)		11°C
(53°F)		14°C
(58°F)		16°C
(61°F)		15°C
(60°F)		13°C
(56°F)		10°C
(51°F)		7°C
(46°F)		6°C
(43°F)
Average low3°C
(38°F)		3°C
(38°F)		3°C
(39°F)		5°C
(41°F)		7°C
(46°F)		10°C
(51°F)		12°C
(55°F)		12°C
(54°F)		10°C
(50°F)		8°C
(46°F)		5°C
(41°F)		4°C
(39°F)
Mean minimum-2°C
(28°F)		-1°C
(30°F)		-2°C
(29°F)		-1°C
(31°F)		1°C
(34°F)		6°C
(43°F)		8°C
(47°F)		8°C
(46°F)		4°C
(40°F)		2°C
(36°F)		-0°C
(32°F)		-1°C
(31°F)
Minimum-5°C
(24°F)		-3°C
(27°F)		-6°C
(22°F)		-3°C
(27°F)		-1°C
(30°F)		5°C
(41°F)		7°C
(44°F)		6°C
(43°F)		2°C
(35°F)		-0°C
(32°F)		-1°C
(30°F)		-4°C
(25°F)

Compare climate in Newcastle with other places

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

Monthly average precipitation in Newcastle, Ireland

Newcastle 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 Newcastle are January, April and September. On average, 58 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Newcastle. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)55 (2.2)79 (3.1)81 (3.2)51 (2.0)72 (2.8)73 (2.9)77 (3.0)94 (3.7)68 (2.7)82 (3.2)88 (3.5)90 (3.5)
Average precipitation days (≥ 1 mm)101516111314131713131415

Monthly sunshine hours in Newcastle, Ireland

The sunniest months in Newcastle are May, June and July, when the sun shines an average of 12 hours 37 minutes a day. Least sunny months in Newcastle: January, November and December receive an average of 3 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Newcastle. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours8314619131139038538533829323012095
Mean daily daylight hours8h 8m9h 50m11h 54m14h 1m15h 53m16h 52m16h 21m14h 39m12h 37m10h 30m8h 36m7h 35m

Solar UV radiation in Newcastle, Ireland

Newcastle 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 Newcastle UV Index data.

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