County Carlow climate

Monthly averages for Carlow, 2021–2025 · Leinster

Carlow sits in the sheltered south-east, between the Blackstairs Mountains and the Barrow valley. It is one of the drier and sunnier counties, with warm summers by Irish standards.

Rain: about 985 mm falls in a year at Carlow, on roughly 162 days, making Carlow the 29th wettest of the 32 counties. October is the wettest month (127 mm) and August the driest (57 mm).

Temperature: July is the warmest month, with afternoons averaging 20°C, and January the coldest, with nights averaging 2°C. Nights average below 2°C in 1 month of the year, so frost is possible in winter.

Sunshine: about 2457 hours a year, the 13th sunniest of the 32 counties. June is the sunniest month (10.1 hours a day) and December the dullest (3.3).

Compare Carlow with its neighbours →

Rainfall

Average total rainfall each month, in millimetres. 985 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 2457 hours a year.

Carlow and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Carlow	985	162	20°C	2°C	2457
Kildare	971	172	20°C	2°C	2476
Kilkenny	1046	164	19°C	2°C	2460
Laois	976	165	20°C	2°C	2479
Wexford	1201	166	20°C	3°C	2756
Wicklow	1132	168	19°C	3°C	2716

Recent extremes, 2021–2025

Hottest day: 28.7°C on 13 August 2022
Coldest night: −6.1°C on 9 January 2025
Wettest day: 46.7 mm on 27 October 2021
Wettest month: October 2022, 176 mm
Driest month: February 2023, 13 mm

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

Carlow month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	2	78	13	4.1	14
February	9	4	79	13	4.3	17
March	11	4	84	14	6.2	15
April	13	4	65	13	8.2	13
May	16	7	78	14	10.0	12
June	18	10	62	11	10.1	13
July	20	12	85	16	9.1	12
August	20	12	57	12	9.1	13
September	17	10	101	13	7.0	13
October	14	8	127	17	5.2	14
November	10	5	79	13	4.0	15
December	9	4	90	14	3.3	16
Year	14	7	985	162	2457 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: Kildare · Kilkenny · Laois · Wexford · Wicklow. All counties: rainfall, temperature, sunshine.