Water temperature of the English Channel in september Where to swim in the English Channel in september 2025?

Several countries border the seaside of the English Channel, including: England, Brittany, North of France, Normandy and Picardy. We measure the water temperature daily in these countries and archive it in order to calculate monthly averages, like those of the month of september.

The seasonal average for the water temperature in the month of september is between 61°F and 65°F. The lowest sea temperature measured this month is 58°F and the highest is 67°F.

The sea temperature map of the English Channel in september

The map below presents a monthly average of the water temperature of the English Channel for the month of september for several coastal cities. You can zoom and move around on the map. By clicking on the markers, you can see sea temperature details by city in september.