County Sligo climate

Monthly averages for Sligo, 2021–2025 · Connacht

Sligo's coast and mountains, Ben Bulben among them, face the north-west and catch plenty of rain and wind. Summers are cool and winters mild, and the county holds Ireland's record low temperature, set at Markree Castle in 1881.

Rain: about 1670 mm falls in a year at Sligo, on roughly 237 days, making Sligo the 1st wettest of the 32 counties. October is the wettest month (171 mm) and April the driest (107 mm).

Temperature: August is the warmest month, with afternoons averaging 18°C, and January the coldest, with nights averaging 2°C. Frost is rare.

Sunshine: about 2268 hours a year, the 29th sunniest of the 32 counties. May is the sunniest month (10.0 hours a day) and December the dullest (2.6).

Compare Sligo with its neighbours →

Rainfall

Average total rainfall each month, in millimetres. 1670 mm a year.

Temperature

Bars run from the average night-time low to the average daytime high, in °C.

Sunshine

Hours of sunshine on an average day in each month. About 2268 hours a year.

Sligo and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Sligo	1670	237	18°C	2°C	2268
Leitrim	1231	192	19°C	3°C	2368
Mayo	1442	209	18°C	3°C	2280
Roscommon	1176	184	19°C	3°C	2326

Recent extremes, 2021–2025

Hottest day: 28.2°C on 21 July 2021
Coldest night: −4.9°C on 19 January 2023
Wettest day: 39.9 mm on 2 October 2025
Wettest month: July 2023, 265 mm
Driest month: April 2021, 50 mm

Ireland's all-time records are on the records page.

Sligo month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	2	127	18	3.2	15
February	9	4	140	20	4.1	18
March	10	4	125	17	5.9	15
April	12	5	107	17	8.2	14
May	15	8	119	16	10.0	13
June	17	10	132	21	8.9	14
July	18	12	146	23	7.9	13
August	18	12	166	22	8.8	14
September	16	10	138	19	6.8	14
October	13	9	171	22	4.5	16
November	10	6	136	20	3.5	16
December	8	4	163	20	2.6	17
Year	13	7	1670	237	2268 h	15

Figures are averages for 2021–2025 at each county town, from the ERA5 weather reanalysis via Open-Meteo. They describe typical lowland weather in each county; hills and exposed coasts are wetter and windier.