Celtic Sea water temperature

Celtic Sea, South Pembrokeshire · Sea/Coast

The current water temperature at Celtic Sea is 18.3 °C (as of September 6, 2026, source: Cefas).

The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.

18.3 °C

Measured: September 6, 2026 · continuously updated

💧 Water 18.3° · ☀️ Air 18.5° · high today 19.5°

Nearby waters

Atlantic, Tenby · 43.7 km away18.6 °C Celtic Sea, Hartland Quay Beach · 70.5 km away20.6 °C Bristolkanal, Combesgate Beach · 77.1 km away19.9 °C Bristolkanal, Croyde Bay Beach · 77.8 km away20.0 °C Atlantic, Woolacombe · 77.8 km away18.9 °C

More measuring points: Celtic Sea

Booby'S Bay22.5 °C Constantine Bay Beach22.2 °C Summerleaze21.9 °C Wherry Town21.6 °C Porthcurno Beach21.4 °C Crooklets21.2 °C

Frequently asked questions

Can you swim at Celtic Sea right now?
The current water temperature is 18.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Celtic Sea?
Currently 18.3 °C (updated continuously).

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