County Cavan climate

Monthly averages for Cavan, 2021–2025 · Ulster

Cavan is drumlin and lake country, inland and fairly wet, with the Cuilcagh mountains on its western edge. Winters are cold and damp, and summers cool and cloudy.

Rain: about 1106 mm falls in a year at Cavan, on roughly 188 days, making Cavan the 18th wettest of the 32 counties. October is the wettest month (133 mm) and January the driest (73 mm).

Temperature: July is the warmest month, with afternoons averaging 19°C, and January the coldest, with nights averaging 2°C. Frost is rare.

Sunshine: about 2393 hours a year, the 21st sunniest of the 32 counties. May is the sunniest month (10.0 hours a day) and December the dullest (2.9).

Compare Cavan with its neighbours →

Rainfall

Average total rainfall each month, in millimetres. 1106 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 2393 hours a year.

Cavan and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Cavan	1106	188	19°C	2°C	2393
Fermanagh	1216	197	19°C	2°C	2301
Leitrim	1231	192	19°C	3°C	2368
Longford	1194	188	19°C	2°C	2408
Meath	978	169	20°C	2°C	2506
Monaghan	1064	185	19°C	2°C	2375
Westmeath	1079	182	19°C	2°C	2442

Recent extremes, 2021–2025

Hottest day: 30.1°C on 18 July 2022
Coldest night: −5.0°C on 9 January 2025
Wettest day: 37.6 mm on 4 September 2022
Wettest month: July 2023, 182 mm
Driest month: March 2025, 27 mm

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

Cavan month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	2	73	13	3.9	15
February	9	4	93	16	4.1	19
March	10	4	87	16	5.7	15
April	12	5	84	16	8.4	14
May	16	8	81	15	10.0	13
June	18	10	77	15	9.8	14
July	19	12	100	18	8.6	12
August	19	12	94	18	9.1	14
September	17	10	108	15	7.0	14
October	14	9	133	18	4.8	16
November	10	5	81	14	4.2	16
December	8	4	95	15	2.9	18
Year	13	7	1106	188	2393 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.

Bordering counties: Fermanagh · Leitrim · Longford · Meath · Monaghan · Westmeath. All counties: rainfall, temperature, sunshine.