Irish Sea water temperature

Irish Sea, Mersey- New Brighton Beach East · Sea/Coast

The current water temperature at Irish Sea is 15.7 °C (as of September 24, 2026, source: Environment Agency).

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

15.7 °C

Measured: September 24, 2026 · continuously updated

💧 Water 15.7° · ☀️ Air 11.8°

Temperature trend of recent weeks

Irish Sea — Photo: James Yardley · CC BY-SA 2.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 8 data points since August 18, 2026.

Lowest recorded value: 15.3 °C on September 10, 2026 · highest value: 19.4 °C on August 18, 2026.

Nearby waters

Irish Sea, Wallasey at Harrison Drive, Wirral Mbc · 2.7 km away14.7 °C Irish Sea, Moreton at Pasture Roadwirral Mbc · 5.9 km away14.9 °C Irish Sea, Meols at Dove Point Wirral Mbc · 8.4 km away13.1 °C Irish Sea, Formby at Formbysefton Mbc · 12.7 km away17.8 °C Irish Sea, West Kirby @ Dee Lane · 12.9 km away14.0 °C

More measuring points: Irish Sea

Cleveleys at Cleveleyswyre Mbc18.6 °C Formby at Formbysefton Mbc17.8 °C Southport at Southportsefton Mbc17.2 °C Allonby at West Windsallerdale Mbc17.1 °C Ainsdale at Ainsdalesefton Mbc16.6 °C St Annes North at Starr Hills16.5 °C

Frequently asked questions

Can you swim at Irish Sea right now?
The current water temperature is 15.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Irish Sea?
Currently 15.7 °C (updated continuously).

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