Irish Sea water temperature

Irish Sea, Liverpool Bay · Sea/Coast

The current water temperature at Irish Sea is 17.1 °C (as of September 20, 2026, source: Cefas).

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

17.1 °C

Measured: September 20, 2026 · continuously updated

💧 Water 17.1° · ☀️ Air 14.6° · high today 15.8°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 143 data points since September 6, 2026.

Lowest recorded value: 17.1 °C on September 18, 2026 · highest value: 18.6 °C on September 6, 2026.

In September, temperatures have ranged between 17.1 °C and 18.6 °C.

The current value is 0.7 °C below the September average of this series.

Nearby waters

Irish Sea, Formby at Formbysefton Mbc · 16.5 km away17.8 °C Irish Sea, Meols at Dove Point Wirral Mbc · 19.4 km away15.7 °C Irish Sea, Moreton at Pasture Roadwirral Mbc · 20.2 km away16.1 °C Irish Sea, Ainsdale at Ainsdalesefton Mbc · 20.9 km away15.7 °C Irish Sea, West Kirby @ Dee Lane · 21.1 km away15.2 °C

More measuring points: Irish Sea

Cleveleys at Cleveleyswyre Mbc18.6 °C Formby at Formbysefton Mbc17.8 °C Blackpool Central at St Chad'S Road17.0 °C St Annes North at Starr Hills16.5 °C Bispham at Bisphamblackpool Mbc16.4 °C Llandudno16.4 °C

Frequently asked questions

Can you swim at Irish Sea right now?
The current water temperature is 17.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Irish Sea?
Currently 17.1 °C (updated continuously).

How warm is at Irish Sea in September?
In September, the water temperature recently averaged 17.8 °C.

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