County Leitrim climate

Monthly averages for Carrick-on-Shannon, 2021–2025 · Connacht

Leitrim is hilly, lake-strewn and famously wet, with heavy clay soils that hold the rain. It has a short coastline near Tullaghan and cool, cloudy summers.

Rain: about 1231 mm falls in a year at Carrick-on-Shannon, on roughly 192 days, making Leitrim the 9th wettest of the 32 counties. October is the wettest month (150 mm) and January the driest (83 mm).

Temperature: July is the warmest month, with afternoons averaging 19°C, and January the coldest, with nights averaging 3°C. Frost is rare.

Sunshine: about 2368 hours a year, the 25th sunniest of the 32 counties. May is the sunniest month (10.0 hours a day) and December the dullest (2.9).

Compare Leitrim with its neighbours →

Rainfall

Average total rainfall each month, in millimetres. 1231 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 2368 hours a year.

Leitrim and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Leitrim	1231	192	19°C	3°C	2368
Cavan	1106	188	19°C	2°C	2393
Donegal	1211	200	18°C	3°C	2212
Fermanagh	1216	197	19°C	2°C	2301
Longford	1194	188	19°C	2°C	2408
Roscommon	1176	184	19°C	3°C	2326
Sligo	1670	237	18°C	2°C	2268

Recent extremes, 2021–2025

Hottest day: 30.0°C on 18 July 2022
Coldest night: −3.7°C on 9 January 2021
Wettest day: 44.1 mm on 23 November 2024
Wettest month: October 2022, 193 mm
Driest month: February 2023, 30 mm

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

Carrick-on-Shannon month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	3	83	14	3.8	14
February	9	4	99	16	4.2	18
March	11	4	91	16	5.7	15
April	13	5	90	16	8.3	14
May	16	8	83	14	10.0	13
June	18	11	92	16	9.5	14
July	19	13	103	15	8.4	12
August	19	12	108	18	8.9	14
September	17	11	104	16	7.0	13
October	14	9	150	19	4.9	15
November	10	6	106	16	4.1	15
December	8	4	122	17	2.9	17
Year	13	7	1231	192	2368 h	14

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.

Bordering counties: Cavan · Donegal · Fermanagh · Longford · Roscommon · Sligo. All counties: rainfall, temperature, sunshine.