Your Ultimate Boating Resource

HomeForecastsCalifornia ForecastsPort Costa, CA Marine Weather

Port Costa, CA Marine Weather Forecast

Tonight - 53°F
May 17, 2026
8 to 14 mph W
Mostly Clear
Mostly clear, with a low around 53. West wind 8 to 14 mph, with gusts as high as 22 mph.
Sunday - 78°F
May 17, 2026
8 to 17 mph NW
Sunny
Sunny, with a high near 78. Northwest wind 8 to 17 mph, with gusts as high as 28 mph.
Sunday Night - 61°F
May 17, 2026
18 mph N
Clear
Clear, with a low around 61. North wind around 18 mph, with gusts as high as 30 mph.
Monday - 85°F
May 18, 2026
10 to 18 mph NNW
Sunny
Sunny, with a high near 85. North northwest wind 10 to 18 mph, with gusts as high as 30 mph.
Monday Night - 56°F
May 18, 2026
2 to 10 mph W
Clear
Clear, with a low around 56. West wind 2 to 10 mph.
Tuesday - 89°F
May 19, 2026
2 to 12 mph WNW
Sunny
Sunny, with a high near 89.
Tuesday Night - 55°F
May 19, 2026
3 to 12 mph WSW
Clear
Clear, with a low around 55.
Wednesday - 85°F
May 20, 2026
2 to 10 mph SW
Sunny
Sunny, with a high near 85.
Wednesday Night - 54°F
May 20, 2026
5 to 10 mph SW
Mostly Clear
Mostly clear, with a low around 54.
Thursday - 82°F
May 21, 2026
3 to 12 mph SW
Sunny
Sunny, with a high near 82.
Thursday Night - 53°F
May 21, 2026
7 to 12 mph SW
Mostly Clear
Mostly clear, with a low around 53.
Friday - 74°F
May 22, 2026
7 to 13 mph SW
Sunny
Sunny, with a high near 74.
Friday Night - 53°F
May 22, 2026
12 mph SW
Partly Cloudy
Partly cloudy, with a low around 53.
Saturday - 70°F
May 23, 2026
9 to 14 mph SW
Sunny
Sunny, with a high near 70.

Don't Miss

Add us on Google to stay connected!
Add Us on Google