Monthly weather forecast and climate
Alderney, Guernsey

Average sea temperature - Alderney, Guernsey

The best month for swimming (with the highest average sea temperature) is September (17.4°C).
The coldest month (with the lowest average sea temperature) is March (9.3°C).

Average daylight - Alderney, Guernsey

The month with the longest days is June (Average daylight: 16.2h).
The month with shortest days is December (Average daylight: 8.2h).