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

September weather forecast and climate
Alameda, CA

Ocean temperature

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

In Alameda, the average length of the day in September is 12.4h.

What month is the ocean warmest in Alameda?

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

What is the ocean temperature in September in Alameda?

In Alameda, in September, the average water temperature is 57.4°F (14.1°C). 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.

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

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

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