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Celtic Sea water temperature

Celtic Sea, Praa Sands (west) · Sea/Coast

The current water temperature at Celtic Sea is 17.1 °C (as of September 18, 2026, source: Environment Agency).

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 18, 2026 · continuously updated
💧 Water 17.1° · ☀️ Air 13.9°
Temperature trend of recent weeks
Celtic Sea
Photo: RichTea · CC BY-SA 2.0 · Wikimedia Commons

Nearby waters

Celtic Sea, Praa Sands (east) · 1.0 km away17.9 °CCeltic Sea, Perranuthnoe · 3.8 km away18.0 °CCeltic Sea, Porthleven Sands · 6.0 km away17.7 °CEnglish Channel, Porthleven Sands · 6.8 km away16.3 °CCeltic Sea, Marazion · 6.9 km away16.2 °C

More measuring points: Celtic Sea

Fistral South21.0 °CTolcarne Beach (newquay)19.6 °CCrantock Beach19.5 °CHarlyn Bay Beach19.4 °CPerranporth (penhale Sands) Beach19.4 °CMother Ivey'S Bay19.3 °C

Frequently asked questions

Can you swim at Celtic 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 Celtic Sea?
Currently 17.1 °C (updated continuously).

Open in the BrrChecker app

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