Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Alderney, Guernsey

Sea temperature

In Abril, the average sea temperature in Alderney, Guernsey, is 10.3°C (50.5°F).
Note: Swimming in 10.3°C (50.5°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.


In Alderney, Guernsey, the average length of the day in Abril is 13.8h.

What is the water temperature in Abril in Alderney?

In Alderney, Guernsey, in Abril, the average water temperature is 10.3°C (50.5°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the average length of the day in Abril in Alderney?

The average length of the day in Abril in Alderney, Guernsey, is 13.8h.
Average sea temperature in April - Alderney, Guernsey
  • Average sea temperature in April: 10.3°C

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 in April - Alderney, Guernsey
  • Average daylight in April: 13.8h

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