Port-Fontaine Sea Water Temperature
A temperate beach on the Celtic Sea, warmest around August at about 18.3°C. Today's reading, 7-day forecast, and monthly averages below.
Port-Fontaine water temperature
Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing.
7-Day Water Temperature Forecast
Port-Fontaine Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Port-Fontaine occurs inJune, July, August, September — peaking at18.3°C (64.9°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 | 8.4°C | 10.5°C | 12.4°C | Very Cold (< 16°C) |
| February | 8°C | 9.8°C | 11.6°C | Very Cold (< 16°C) |
| March | 7.9°C | 10°C | 11.5°C | Very Cold (< 16°C) |
| April | 10.5°C | 11.7°C | 14.8°C | Very Cold (< 16°C) |
| May | 11.9°C | 14.1°C | 17.7°C | Very Cold (< 16°C) |
| June | 14.1°C | 16.3°C | 18.1°C | Cool / Refreshing (16°C – 20°C) |
| July | 14.5°C | 17.8°C | 20.4°C | Cool / Refreshing (16°C – 20°C) |
| August | 16.4°C | 18.3°C | 21.3°C | Cool / Refreshing (16°C – 20°C) |
| SeptemberCurrent | 14.7°C | 17.4°C | 19.2°C | Cool / Refreshing (16°C – 20°C) |
| October | 14.3°C | 16.2°C | 18.7°C | Cool / Refreshing (16°C – 20°C) |
| November | 11.9°C | 14.1°C | 16.1°C | Very Cold (< 16°C) |
| December | 10.9°C | 12.2°C | 13.6°C | Very Cold (< 16°C) |
Swimming FAQs for Port-Fontaine
Is the sea warm enough to swim in Port-Fontaine today?
Typical sea surface temperature in Port-Fontaine this time of year is 17.4°C (63.3°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 Port-Fontaine?
The highest water temperatures in Port-Fontaine typically occur duringJune, July, August, September, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Port-Fontaine in September?
Historically in September, water temperatures in Port-Fontaine average around17.4°C (63.3°F), fluctuating between a recorded minimum of 14.7°C and a maximum of 19.2°C.