County Monaghan climate

Monthly averages for Monaghan, 2021–2025 · Ulster

Monaghan is rolling drumlin farmland in the north-east, inland and cool, with moderate rainfall and cold winter nights. It is sheltered from the Atlantic but open to cold northerly and easterly winds.

Rain: about 1064 mm falls in a year at Monaghan, on roughly 185 days, making Monaghan the 22nd wettest of the 32 counties. October is the wettest month (121 mm) and January the driest (65 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 2375 hours a year, the 24th sunniest of the 32 counties. May is the sunniest month (9.9 hours a day) and December the dullest (2.7).

Compare Monaghan with its neighbours →

Rainfall

Average total rainfall each month, in millimetres. 1064 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 2375 hours a year.

Monaghan and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Monaghan	1064	185	19°C	2°C	2375
Armagh	1008	177	19°C	2°C	2433
Cavan	1106	188	19°C	2°C	2393
Fermanagh	1216	197	19°C	2°C	2301
Louth	1063	172	19°C	2°C	2524
Meath	978	169	20°C	2°C	2506
Tyrone	1200	200	18°C	2°C	2255

Recent extremes, 2021–2025

Hottest day: 30.2°C on 18 July 2022
Coldest night: −5.1°C on 9 January 2021
Wettest day: 34.1 mm on 28 October 2022
Wettest month: July 2023, 214 mm
Driest month: January 2022, 24 mm

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

Monaghan month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	2	65	12	3.8	15
February	9	4	82	15	4.0	19
March	10	3	82	16	5.8	15
April	12	4	79	15	8.4	13
May	16	8	78	16	9.9	13
June	18	10	79	15	9.9	14
July	19	12	101	18	8.6	12
August	19	12	93	16	9.0	14
September	17	10	106	16	7.0	14
October	14	8	121	18	4.8	16
November	10	5	84	14	4.0	16
December	8	4	94	15	2.7	18
Year	13	7	1064	185	2375 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: Armagh · Cavan · Fermanagh · Louth · Meath · Tyrone. All counties: rainfall, temperature, sunshine.