Mill Bay Sea Water Temperature
A temperate beach on the Celtic Sea, warmest around August at about 16.9°C. Today's reading, 7-day forecast, and monthly averages below.
Mill Bay water temperature
Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing.
7-Day Water Temperature Forecast
Mill Bay Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Mill Bay occurs inJuly, August, September, October — peaking at16.9°C (62.4°F) in August.
Year-Round Water Temperature Curve (°C / °F)
Hover a bar for detailsFull 12-month data table — min / avg / max & swimming comfort
| Month | Min Water Temp | Average Water Temp | Max Water Temp | Swimming Comfort |
|---|---|---|---|---|
| January | 9.1°C | 10.8°C | 12°C | Very Cold (< 16°C) |
| February | 8.4°C | 10°C | 11.3°C | Very Cold (< 16°C) |
| March | 8.2°C | 9.6°C | 10.8°C | Very Cold (< 16°C) |
| April | 9.1°C | 10.3°C | 11.6°C | Very Cold (< 16°C) |
| May | 9.9°C | 11.8°C | 14.5°C | Very Cold (< 16°C) |
| June | 11.5°C | 14.3°C | 16.5°C | Very Cold (< 16°C) |
| July | 13.3°C | 16.2°C | 19°C | Cool / Refreshing (16°C – 20°C) |
| August | 15.7°C | 16.9°C | 20.4°C | Cool / Refreshing (16°C – 20°C) |
| SeptemberCurrent | 14.7°C | 16.1°C | 17.3°C | Cool / Refreshing (16°C – 20°C) |
| October | 13.7°C | 15.1°C | 16.2°C | Very Cold (< 16°C) |
| November | 10.8°C | 13.5°C | 15.6°C | Very Cold (< 16°C) |
| December | 10.5°C | 11.9°C | 13.2°C | Very Cold (< 16°C) |
Swimming FAQs for Mill Bay
Is the sea warm enough to swim in Mill Bay today?
Typical sea surface temperature in Mill Bay this time of year is 16.1°C (61°F) — classified as Cool / Refreshing (16°C – 20°C). Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing. Live readings load automatically.
What are the warmest months for swimming in Mill Bay?
The highest water temperatures in Mill Bay typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Mill Bay in September?
Historically in September, water temperatures in Mill Bay average around16.1°C (61.0°F), fluctuating between a recorded minimum of 14.7°C and a maximum of 17.3°C.