Irish Sea water temperature

Irish Sea, Rosslare · 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 12.6° · high today 18.5°

Temperature trend of recent weeks

Irish Sea — Photo: Rob Motha · CC BY-SA 2.0 · Wikimedia Commons

Water quality

EU classification: excellent

Measurement series & statistics

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

Lowest recorded value: 15.1 °C on July 5, 2026 · highest value: 19.9 °C on August 12, 2026.

Nearby waters

Assaly-Mündung, Assaly · 3.4 km away16.6 °C Lady's Island Lake, Lady's Island · 7.0 km away18.2 °C Horse River, Ballynagee · 8.7 km away10.7 °C Lough Tacumshin, Sigginstown · 9.2 km away19.4 °C Slaney, Ferrycarrig Bridge · 12.1 km away18.6 °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).

How is the water quality at Irish Sea?
The official classification is: excellent.

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