Celtic Sea water temperature
Celtic Sea, Ballycotton · Sea/Coast
The current water temperature at Celtic Sea is 14.6 °C (as of October 16, 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.
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Measurement series & statistics
This measurement series includes 1418 data points since August 17, 2026.
Lowest recorded value: 14.4 °C on October 8, 2026 · highest value: 18.6 °C on August 28, 2026.
In October, temperatures have ranged between 14.4 °C and 15.9 °C.
The current value is 0.4 °C below the October average of this series.
Nearby waters
More measuring points: Celtic Sea
Frequently asked questions
Can you swim at Celtic Sea right now?
The current water temperature is 14.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Celtic Sea?
Currently 14.6 °C (updated continuously).
How warm is at Celtic Sea in October?
In October, the water temperature recently averaged 15.0 °C.
When is the water warmest at Celtic Sea?
Across the measurement record, August is on average the warmest month (17.3 °C).
