Irish Sea water temperature

Irish Sea, Portmarnock · Sea/Coast

The current water temperature at Irish Sea is 17.7 °C (as of September 1, 2026, source: Open-Meteo marine model).

The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.

17.7 °C

Measured: September 1, 2026 · continuously updated

💧 Water 17.7° · ☀️ Air 12.3° · high today 19.6°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 595 data points since July 3, 2026.

Lowest recorded value: 16.3 °C on July 3, 2026 · highest value: 20.3 °C on July 17, 2026.

Nearby waters

Dodder, Anglesea Road · 8.8 km away15.7 °C Broadmeadow · 10.6 km away15.6 °C Tolka, Clonee Weir · 18.7 km away14.8 °C Dargle, Ravenswell Road · 20.7 km away17.2 °C Ryewater, Leixlip · 22.6 km away16.3 °C

More measuring points: Irish Sea

Southport at Southportsefton Mbc26.0 °C Walney Sandy Gap at Sandy Gapbarrow-In-Furness Mbc22.7 °C Walney Biggar Bank at Biggar Bankbarrow-In-Furness Mbc22.6 °C Ainsdale at Ainsdalesefton Mbc22.2 °C St.annes at St.annes Pierfylde Mbc21.9 °C St Annes North at Starr Hills21.9 °C

Frequently asked questions

Can you swim at Irish Sea right now?
The current water temperature is 17.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Irish Sea?
Currently 17.7 °C (updated continuously).

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