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

September weather forecast and climate
Belvedere, CA

Ocean temperature

With an average ocean temperature of 57.4°F (14.1°C), September is the month with the warmest seawater in Belvedere, California.
Note: Swimming in 57.4°F (14.1°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 September in Belvedere is 12.4h.

What month is the ocean warmest in Belvedere?

September is the month with the warmest seawater in Belvedere, California, with an average ocean temperature of 57.4°F (14.1°C).

How cold is the water in September in Belvedere?

In Belvedere, the average seawater temperature in September is 57.4°F (14.1°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 Belvedere have in September?

In September, the average length of the day in Belvedere is 12.4h.
Average sea temperature in September - Belvedere, CA
  • Average sea temperature in September: 57.3°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 September - Belvedere, CA
  • Average daylight in September: 12.4h

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