September weather forecast
Bainbridge Island, WA

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Weather in September

Ocean temperature

The months with the warmest seawater in Bainbridge Island, Washington, are August and September, with an average ocean temperature of 53.2°F (11.8°C).
Note: If planning to swim in 53.2°F (11.8°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

In September, the average length of the day in Bainbridge Island is 12h and 33min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:50 pm PDT.
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Frequently asked questions

When is the ocean warmest in Bainbridge Island?

The months with the warmest seawater in Bainbridge Island are August and September, with an average ocean temperature of 53.2°F (11.8°C).

How cold is the water in September in Bainbridge Island?

In Bainbridge Island, Washington, in September, the average water temperature is 53.2°F (11.8°C). Swimming in 53.2°F (11.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in September in Bainbridge Island?

In Bainbridge Island, the average day length in September is 12h and 33min.

What time are sunrise and sunset in September in Bainbridge Island?

On the first day of September in Bainbridge Island, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:50 pm PDT.

Average sea temperature in September
Bainbridge Island, WA

Average sea temperature in September - Bainbridge Island, WA
  • Average sea temperature in September: 53.1°F

The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

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Average daylight in September
Bainbridge Island, WA

Average daylight in September - Bainbridge Island, WA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

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Bainbridge Island, Washington, USA

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