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Port Costa, CA Marine Weather Forecast

Tonight - 57°F
Aug 18, 2026
9 mph WSW
Mostly Cloudy
Mostly cloudy, with a low around 57. West southwest wind around 9 mph.
Tuesday - 81°F
Aug 18, 2026
10 mph SW
Mostly Sunny
Mostly sunny, with a high near 81. Southwest wind around 10 mph.
Tuesday Night - 58°F
Aug 18, 2026
10 mph SW
Partly Cloudy
Partly cloudy, with a low around 58. Southwest wind around 10 mph.
Wednesday - 78°F
Aug 19, 2026
8 to 12 mph SW
Mostly Sunny
Mostly sunny, with a high near 78. Southwest wind 8 to 12 mph.
Wednesday Night - 58°F
Aug 19, 2026
12 mph SW
Partly Cloudy
Partly cloudy, with a low around 58. Southwest wind around 12 mph.
Thursday - 77°F
Aug 20, 2026
12 mph SW
Partly Sunny
Partly sunny, with a high near 77.
Thursday Night - 59°F
Aug 20, 2026
12 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 59.
Friday - 77°F
Aug 21, 2026
13 mph SW
Mostly Sunny
Mostly sunny, with a high near 77.
Friday Night - 58°F
Aug 21, 2026
8 to 13 mph SW
Partly Cloudy
Partly cloudy, with a low around 58.
Saturday - 77°F
Aug 22, 2026
10 mph SW
Mostly Sunny
Mostly sunny, with a high near 77.
Saturday Night - 57°F
Aug 22, 2026
10 mph SW
Mostly Clear
Mostly clear, with a low around 57.
Sunday - 74°F
Aug 23, 2026
8 to 12 mph SW
Mostly Sunny
Mostly sunny, with a high near 74.
Sunday Night - 57°F
Aug 23, 2026
12 mph SW
Partly Cloudy
Partly cloudy, with a low around 57.
Monday - 72°F
Aug 24, 2026
12 mph SW
Mostly Sunny
Mostly sunny, with a high near 72.

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