Alameda
California, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Alameda, CA

Ocean temperature

April through June, with an average ocean temperature of 53.1°F (11.7°C), are months with the coldest seawater in Alameda, California.
Note: Swimming in 53.1°F (11.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in April is 13.2h.

When is the ocean coldest in Alameda?

Through and June, with an average ocean temperature of 53.1°F (11.7°C).

How cold is the water in April in Alameda?

In Alameda, in April, the average water temperature is 53.1°F (11.7°C). At temperatures below 50°F (10°C), 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 55.4°F (13°C) is not comfortable.

What is the average length of the day in April in Alameda?

In Alameda, the average length of the day in April is 13.2h.
Average sea temperature in April - Alameda, CA
  • Average sea temperature in April: 53°F

The best month for swimming (with the highest average sea temperature) is September (57.3°F).
Coldest months (with the lowest average sea temperature) are April and June (53°F).

Average daylight in April - Alameda, CA
  • Average daylight in April: 13.2h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).