Weather in September
Ocean temperature
The months with the warmest seawater in Seacliff State Beach, California, are August and September, with an average ocean temperature of 58.1°F (14.5°C).Note: If planning to swim in 58.1°F (14.5°C) under 50°F (10°C), wear a protective suit. Neglecting this advice might cause immediate cold shock and troubled breathing. A splash around 55.4°F (13°C) is not much warmer.
Daylight
The average length of the day in September in Seacliff State Beach is 12h and 24min.On the first day of September, sunrise is at 6:39 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.
Updated: Jul 7, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
When is the ocean warmest?
August and September, with an average ocean temperature of 58.1°F (14.5°C), are months with the warmest seawater.
How cold is the water in September?
In Seacliff State Beach, the average seawater temperature in September is 58.1°F (14.5°C). Swimming in 58.1°F (14.5°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.
How many hours of daylight does Seacliff State Beach have in September?
In September, the average day length is 12h and 24min.
When are sunrise and sunset in September?
In September, on the first day of the month, sunrise is at 6:39 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.
Average sea temperature in September
Seacliff State Beach, CA
- Average sea temperature in September: 58.1°F
The best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).
Average daylight in September
Seacliff State Beach, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
Seacliff State Beach, California, USA
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