Irish Sea water temperature
Irish Sea, Cleveleys at Cleveleyswyre Mbc · Sea/Coast
The current water temperature at Irish Sea is 18.6 °C (as of September 6, 2026, source: official monitoring networks).
The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.
Measurement series & statistics
This measurement series includes 10 data points since July 23, 2026.
Lowest recorded value: 16.5 °C on September 4, 2026 · highest value: 20.5 °C on July 23, 2026.
In September, temperatures have ranged between 16.5 °C and 18.6 °C.
The current value is 1.0 °C above the September average of this series.
Nearby waters
More measuring points: Irish Sea
Frequently asked questions
Can you swim at Irish Sea right now?
The current water temperature is 18.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Irish Sea?
Currently 18.6 °C (updated continuously).
How warm is at Irish Sea in September?
In September, the water temperature recently averaged 17.6 °C.
