Celtic Sea water temperature

Celtic Sea, Upton Towans · Sea/Coast

The current water temperature at Celtic Sea is 18.0 °C (as of August 21, 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.

18.0 °C

Measured: August 21, 2026 · continuously updated

💧 Water 18.0° · ☀️ Air 17.2°

Temperature trend of recent weeks

Nearby waters

Celtic Sea, Hayle Towans · 0.7 km away18.0 °C Celtic Sea, Mexico Towans · 1.4 km away18.0 °C Celtic Sea, Gwithian Towans · 2.4 km away18.5 °C Celtic Sea, Porth Kidney Sands · 2.7 km away18.6 °C Celtic Sea, Godrevy Towans · 2.9 km away18.2 °C

More measuring points: Celtic Sea

Booby'S Bay22.5 °C Constantine Bay Beach22.2 °C Harlyn Bay Beach22.2 °C Pendower Beach22.0 °C Mother Ivey'S Bay21.9 °C Swanpool Beach21.8 °C

Frequently asked questions

Can you swim at Celtic Sea right now?
The current water temperature is 18.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Celtic Sea?
Currently 18.0 °C (updated continuously).

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