Celtic Sea water temperature

Celtic Sea, Polstreath Beach · Sea/Coast

The current water temperature at Celtic Sea is 19.9 °C (as of August 18, 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.

19.9 °C

Measured: August 18, 2026 · continuously updated

💧 Water 19.9° · ☀️ Air 18.1°

Temperature trend of recent weeks

Nearby waters

Celtic Sea, Portmellon Beach · 1.4 km away19.7 °C Celtic Sea, Pentewan Beach · 1.5 km away18.9 °C Celtic Sea, Gorran Haven (little Perhaver) Beach · 3.7 km away19.6 °C Celtic Sea, Vault Beach · 4.4 km away20.5 °C Celtic Sea, Porthpean Beach · 5.6 km away19.1 °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 19.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Celtic Sea?
Currently 19.9 °C (updated continuously).

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