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

April weather forecast and climate
Hercules, CA

Ocean temperature

April is the month with the coldest seawater in Hercules, California, with an average ocean temperature of 52.7°F (11.5°C).
Note: Swimming in 52.7°F (11.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

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

When is the ocean coldest in Hercules?

With an average ocean temperature of 52.7°F (11.5°C), April is the month with the coldest seawater in Hercules, California.

What is the ocean temperature in April in Hercules?

In Hercules, California, the average seawater temperature in April is 52.7°F (11.5°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.

How many hours of daylight does Hercules have in April?

In April, the average length of the day in Hercules is 13.2h.
Average sea temperature in April - Hercules, CA
  • Average sea temperature in April: 52.6°F

The best month for swimming (with the highest average sea temperature) is September (57°F).
The coldest month (with the lowest average sea temperature) is April (52.6°F).

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

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.6h).