County Offaly climate

Monthly averages for Tullamore, 2021–2025 · Leinster

Offaly is bog and lowland in the heart of the midlands, well away from the sea. It has a wider range of temperatures than the coast, with warm summer days and sharp frosts in winter.

Rain: about 1064 mm falls in a year at Tullamore, on roughly 178 days, making Offaly the 21st wettest of the 32 counties. October is the wettest month (120 mm) and June the driest (69 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 2409 hours a year, the 19th sunniest of the 32 counties. June is the sunniest month (9.9 hours a day) and December the dullest (3.0).

Compare Offaly 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 2409 hours a year.

Offaly and its neighbours
County	Rain mm/yr	Rain days	July high	January low	Sun h/yr
Offaly	1064	178	19°C	2°C	2409
Galway	1424	198	19°C	3°C	2451
Kildare	971	172	20°C	2°C	2476
Laois	976	165	20°C	2°C	2479
Meath	978	169	20°C	2°C	2506
Roscommon	1176	184	19°C	3°C	2326
Tipperary	1019	173	19°C	2°C	2457
Westmeath	1079	182	19°C	2°C	2442

Recent extremes, 2021–2025

Hottest day: 29.4°C on 18 July 2022
Coldest night: −5.3°C on 9 January 2025
Wettest day: 36.6 mm on 15 July 2025
Wettest month: October 2022, 181 mm
Driest month: February 2023, 23 mm

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

Tullamore month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	2	84	12	3.9	15
February	9	4	87	15	4.0	19
March	11	4	85	14	6.0	15
April	13	5	72	14	8.4	14
May	16	8	88	14	9.8	13
June	18	11	69	14	9.9	14
July	19	12	99	17	8.6	13
August	19	12	79	14	8.9	14
September	17	10	99	15	7.1	14
October	14	9	120	17	5.3	16
November	10	6	90	16	4.1	16
December	8	4	92	15	3.0	18
Year	14	7	1064	178	2409 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: Galway · Kildare · Laois · Meath · Roscommon · Tipperary · Westmeath. All counties: rainfall, temperature, sunshine.