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Monthly climate in Roscommon, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Roscommon features a oceanic climate (Cfb). Temperatures typically range between 6 °C (42 °F) and 16 °C (60 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 29 °C (84 °F). The average annual precipitation amounts to about 1116 mm (43.9 inches) and receives 178 rainy days on the 1 mm (0.04 inches) threshold annually. Roscommon enjoys an average of 2664 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 Roscommon, Ireland

The warmest months in Roscommon are June, July and August, with daily mean temperatures ranging from 14 to 16 °C (57 - 60 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 6 °C (42 - 44 °F) throughout the day. On average each year, Roscommon experiences 2 days above 25 °C (77.0 °F) and 14 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Roscommon. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		15°C
(59°F)		17°C
(63°F)		21°C
(70°F)		25°C
(77°F)		29°C
(84°F)		28°C
(83°F)		23°C
(74°F)		25°C
(77°F)		20°C
(68°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum12°C
(54°F)		12°C
(55°F)		14°C
(58°F)		18°C
(64°F)		22°C
(72°F)		22°C
(71°F)		24°C
(76°F)		22°C
(72°F)		21°C
(70°F)		17°C
(62°F)		14°C
(57°F)		13°C
(55°F)
Average high8°C
(46°F)		8°C
(47°F)		10°C
(50°F)		12°C
(54°F)		15°C
(60°F)		17°C
(63°F)		19°C
(66°F)		18°C
(64°F)		16°C
(61°F)		13°C
(55°F)		10°C
(50°F)		8°C
(47°F)
Daily mean6°C
(42°F)		6°C
(43°F)		7°C
(44°F)		9°C
(48°F)		12°C
(53°F)		14°C
(57°F)		16°C
(60°F)		15°C
(59°F)		13°C
(56°F)		10°C
(51°F)		8°C
(46°F)		6°C
(44°F)
Average low3°C
(39°F)		3°C
(39°F)		4°C
(39°F)		5°C
(42°F)		8°C
(46°F)		10°C
(51°F)		12°C
(54°F)		12°C
(54°F)		10°C
(51°F)		8°C
(46°F)		5°C
(42°F)		4°C
(40°F)
Mean minimum-2°C
(29°F)		-1°C
(30°F)		-1°C
(31°F)		-0°C
(32°F)		2°C
(36°F)		6°C
(43°F)		8°C
(47°F)		8°C
(46°F)		5°C
(41°F)		2°C
(37°F)		0°C
(32°F)		-1°C
(31°F)
Minimum-4°C
(25°F)		-3°C
(26°F)		-5°C
(24°F)		-1°C
(30°F)		-1°C
(31°F)		5°C
(40°F)		7°C
(45°F)		7°C
(45°F)		2°C
(36°F)		0°C
(33°F)		-3°C
(28°F)		-5°C
(24°F)

Compare climate in Roscommon with other places

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

Monthly average precipitation in Roscommon, Ireland

Roscommon usually has the most precipitation in February, August and October, with an average of 16 rainy days and 119 mm (4.7 inches) of precipitation per month. The driest months in Roscommon are January, April and May. On average, 69 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Roscommon. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)72 (2.8)117 (4.6)96 (3.8)59 (2.3)77 (3.0)90 (3.5)83 (3.3)132 (5.2)80 (3.2)108 (4.2)97 (3.8)105 (4.1)
Average precipitation days (≥ 1 mm)121617111315131815161616

Monthly sunshine hours in Roscommon, Ireland

The sunniest months in Roscommon are May, June and July, when the sun shines an average of 11 hours 36 minutes a day. Least sunny months in Roscommon: January, November and December receive an average of 2 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Roscommon. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours6812916427936634935229026320910881
Mean daily daylight hours8h 5m9h 48m11h 54m14h 3m15h 57m16h 57m16h 24m14h 42m12h 37m10h 29m8h 34m7h 31m

Solar UV radiation in Roscommon, Ireland

Roscommon 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 Roscommon UV Index data.

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