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Costa Mesa, CA Marine Weather Forecast

Tonight - 68°F
Aug 18, 2026
5 to 10 mph W
Partly Cloudy
Partly cloudy, with a low around 68. West wind 5 to 10 mph.
Tuesday - 77°F
Aug 18, 2026
5 to 10 mph W
Mostly Sunny
Mostly sunny, with a high near 77. West wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night - 69°F
Aug 18, 2026
5 to 10 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 69. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday - 78°F
Aug 19, 2026
5 to 10 mph SW
Mostly Sunny
Mostly sunny, with a high near 78. Southwest wind 5 to 10 mph.
Wednesday Night - 69°F
Aug 19, 2026
5 to 10 mph S
Partly Cloudy
Partly cloudy, with a low around 69. South wind 5 to 10 mph.
Thursday - 78°F
Aug 20, 2026
5 to 10 mph S
Mostly Sunny
Mostly sunny, with a high near 78.
Thursday Night - 69°F
Aug 20, 2026
5 to 10 mph S
Partly Cloudy
Partly cloudy, with a low around 69.
Friday - 78°F
Aug 21, 2026
5 to 10 mph S
Mostly Sunny
Mostly sunny, with a high near 78.
Friday Night - 69°F
Aug 21, 2026
5 to 10 mph S
Partly Cloudy
Partly cloudy, with a low around 69.
Saturday - 78°F
Aug 22, 2026
5 to 10 mph SW
Mostly Sunny
Mostly sunny, with a high near 78.
Saturday Night - 69°F
Aug 22, 2026
5 to 10 mph SW
Mostly Clear
Mostly clear, with a low around 69.
Sunday - 77°F
Aug 23, 2026
5 to 10 mph SW
Sunny
Sunny, with a high near 77.
Sunday Night - 68°F
Aug 23, 2026
5 to 10 mph W
Mostly Clear
Mostly clear, with a low around 68.
Monday - 76°F
Aug 24, 2026
5 to 15 mph W
Sunny
Sunny, with a high near 76.

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