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Monthly climate in Donegal, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Donegal features a oceanic climate (Cfb). Temperatures typically range between 5 °C (42 °F) and 15 °C (58 °F) through the year, but rarely can drop to -5 °C (23 °F) or can rise to as high as 27 °C (82 °F). The average annual precipitation amounts to about 1399 mm (55.1 inches) and receives 214 rainy days on the 1 mm (0.04 inches) threshold annually. Donegal enjoys an average of 2789 hours of sunshine throughout the year, and daylight varies from 7 hours 19 minutes to 17 hours 10 minutes per day.

Monthly average temperatures in Donegal, Ireland

The warmest months in Donegal are June, July and August, with daily mean temperatures ranging from 13 to 15 °C (56 - 58 °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, Donegal experiences 1 days above 25 °C (77.0 °F) and 17 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Donegal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		14°C
(58°F)		17°C
(62°F)		20°C
(69°F)		25°C
(77°F)		27°C
(82°F)		27°C
(81°F)		23°C
(73°F)		24°C
(76°F)		19°C
(67°F)		15°C
(58°F)		13°C
(55°F)
Mean maximum12°C
(53°F)		12°C
(53°F)		14°C
(57°F)		17°C
(63°F)		22°C
(71°F)		21°C
(70°F)		24°C
(76°F)		21°C
(71°F)		20°C
(69°F)		16°C
(62°F)		14°C
(57°F)		12°C
(53°F)
Average high7°C
(45°F)		8°C
(46°F)		9°C
(48°F)		11°C
(53°F)		14°C
(58°F)		16°C
(61°F)		18°C
(64°F)		17°C
(63°F)		15°C
(60°F)		12°C
(54°F)		9°C
(49°F)		8°C
(46°F)
Daily mean5°C
(42°F)		5°C
(42°F)		6°C
(43°F)		8°C
(47°F)		11°C
(52°F)		13°C
(56°F)		15°C
(58°F)		14°C
(58°F)		12°C
(55°F)		10°C
(50°F)		7°C
(45°F)		6°C
(43°F)
Average low3°C
(38°F)		3°C
(37°F)		3°C
(38°F)		4°C
(40°F)		7°C
(45°F)		10°C
(50°F)		11°C
(53°F)		11°C
(53°F)		10°C
(50°F)		7°C
(46°F)		5°C
(41°F)		4°C
(39°F)
Mean minimum-3°C
(27°F)		-2°C
(29°F)		-1°C
(30°F)		-1°C
(31°F)		2°C
(35°F)		5°C
(42°F)		7°C
(45°F)		7°C
(45°F)		4°C
(40°F)		2°C
(36°F)		-0°C
(32°F)		-0°C
(32°F)
Minimum-5°C
(24°F)		-5°C
(23°F)		-5°C
(24°F)		-2°C
(28°F)		-1°C
(30°F)		4°C
(40°F)		6°C
(44°F)		5°C
(41°F)		2°C
(36°F)		-0°C
(32°F)		-4°C
(25°F)		-2°C
(28°F)

Compare climate in Donegal with other places

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

Monthly average precipitation in Donegal, Ireland

Donegal usually has the most precipitation in February, August and October, with an average of 19 rainy days and 148 mm (5.8 inches) of precipitation per month. The driest months in Donegal are January, April and May. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Donegal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)95 (3.7)142 (5.6)128 (5.0)65 (2.6)85 (3.4)114 (4.5)108 (4.2)164 (6.5)112 (4.4)139 (5.5)116 (4.6)131 (5.2)
Average precipitation days (≥ 1 mm)161718141417172218202021

Monthly sunshine hours in Donegal, Ireland

The sunniest months in Donegal are May, June and July, when the sun shines an average of 12 hours 5 minutes a day. Least sunny months in Donegal: January, November and December receive an average of 2 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Donegal. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours6613818329738535936732326921310975
Mean daily daylight hours7h 54m9h 43m11h 54m14h 8m16h 6m17h 10m16h 36m14h 48m12h 38m10h 25m8h 25m7h 19m

Solar UV radiation in Donegal, Ireland

Donegal 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 Donegal UV Index data.

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