Ireland
3 cities
Climate overview
Ireland lies between 51°25′ and 55°23′N as an island nation in the North Atlantic west of Britain, covering roughly 70,273 km² for the Republic only, excluding Northern Ireland, which is covered with the United Kingdom. The terrain consists of a low rolling central plain ringed by coastal mountains including MacGillycuddy's Reeks in Kerry, where Carrauntoohil rises to 1,039 m as the country's highest peak, the Wicklow Mountains east of Dublin, the Mournes in Northern Ireland, and the wild rugged coast of Donegal.
The climate is overwhelmingly oceanic Cfb thanks to the moderating North Atlantic Drift, delivering cool wet winters, mild cloudy summers, very high humidity, persistent low cloud and frequent rainfall throughout the year, with a strong west-to-east gradient making the Atlantic coast far wetter than the interior.
Dublin sees January highs of 8°C with nights of 2°C and July highs of about 20°C, with 760 mm of rainfall distributed evenly through the year. Cork on the south coast sees January highs of 8°C with nights of 3°C and July highs of 19°C, with 1,210 mm, Galway on the wet Atlantic coast January highs of 9°C and July highs of 19–20°C with well over 1,100 mm, Valentia in Kerry January and July highs of 10°C and 18°C with 1,440 mm and severe Atlantic gales among Ireland's stormiest locations, and Belmullet on the northwest Mayo coast January and July highs of 9°C and 18°C with 1,240 mm and ferocious winter Atlantic windstorms.
Ireland has recorded temperature extremes including −19.1°C at Markree Castle (January 1881), 33.3°C at Kilkenny Castle (June 1887), and a July record of 33.0°C at Phoenix Park (18 July 2022). Major weather events include Hurricane Debbie (1961), Storm Ophelia (October 2017, an ex-hurricane), Storm Emma and the Beast from the East cold snap (March 2018), and a notable summer drought in 2018. Winter storms, coastal flooding and peatland degradation are climate concerns.
Our archive covers 3 Irish cities with daily ERA5 reanalysis data going back to 1940. The hottest July afternoons are in Cork, with average highs around 18.9°C, while South Dublin has the coldest January nights, with average lows near 3.3°C. Comparing the last decade against the 1940–1970 baseline, mean temperatures across these cities have risen by about 0.8°C.
How the climate has shifted in Ireland
Average across 3 cities with full ERA5 coverage: 1940–1970 baseline vs the last decade (2016–2025).
- Annual mean temperature
- 10.2°C→11.0°C
- Days above 30°C per year
- 0 days→0 days+0
- Frost days per year
- 16 days→6 days−9
- Tropical nights (≥20°C) per year
- 0 nights→0 nights+0
Warmest year in the record so far: 2023.
What's unusual right now
From a snapshot of the world's largest cities updated each hour. Today's mean temperature compared with each city's long-term average for the same calendar date (ERA5 climatology, 1940 onward). Last 30 days uses each city's rolling daily-mean vs its monthly average. Not a global ranking.
Running cool
Warmer than usual