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Monthly climate in Donegal, Ulster, Ireland

Last updated: May 6, 2024

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, Ulster, 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, Ulster, Ireland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 13°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 maximum 12°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 high 7°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 mean 5°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 low 3°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, Ulster, Ireland with other places around the world.

Monthly average precipitation in Donegal, Ulster, 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, Ulster, Ireland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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) 16 17 18 14 14 17 17 22 18 20 20 21

Monthly sunshine hours in Donegal, Ulster, 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, Ulster, Ireland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 66 138 183 297 385 359 367 323 269 213 109 75
Mean daily daylight hours 7h 54m 9h 43m 11h 54m 14h 8m 16h 6m 17h 10m 16h 36m 14h 48m 12h 38m 10h 25m 8h 25m 7h 19m

Solar UV radiation in Donegal, Ulster, 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, Ulster, Ireland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 2 4 5 7 8 8 7 5 3 2 1