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Celtic Sea water temperature

Celtic Sea, Penzance · Sea/Coast

The current water temperature at Celtic Sea is 18.2 °C (as of September 22, 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.

18.2 °C
Measured: September 22, 2026 · continuously updated
💧 Water 18.2° · ☀️ Air 13.9°
Temperature trend of recent weeks
Celtic Sea
Photo: Bob Embleton · CC BY-SA 2.0 · Wikimedia Commons

Nearby waters

Celtic Sea, Wherry Town · 0.9 km away18.3 °CEnglish Channel, Penzance · 2.5 km away16.2 °CCeltic Sea, Long Rock · 2.6 km away16.0 °CCeltic Sea, Marazion · 4.1 km away16.2 °CCeltic Sea, Perranuthnoe · 6.6 km away18.0 °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 18.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Celtic Sea?
Currently 18.2 °C (updated continuously).

Open in the BrrChecker app

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