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National Weather Service Forecast for: Costa Mesa, CA
Issued by: National Weather Service San Diego, CA
Updated: Fri, 11-Sep-2026 11:51am PDT

Costa Mesa
 
  Saturday

Saturday: Patchy Fog then Mostly Sunny
Patchy Fog then Mostly Sunny
Sunday

Sunday: Patchy Fog then Mostly Sunny
Patchy Fog then Mostly Sunny
Monday

Monday: Sunny
Sunny
Tuesday

Tuesday: Sunny
Sunny
Wednesday

Wednesday: Sunny
Sunny
Thursday

Thursday: Sunny
Sunny
Friday

Friday: Sunny
Sunny
  Hi 84 °F Hi 81 °F Hi 80 °F Hi 78 °F Hi 80 °F Hi 84 °F Hi 87 °F
 
Tonight

Tonight: Partly Cloudy then Patchy Fog
Partly Cloudy then Patchy Fog
Saturday
Night
Saturday Night: Partly Cloudy then Patchy Fog
Partly Cloudy then Patchy Fog
Sunday
Night
Sunday Night: Mostly Clear
Mostly Clear
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
Tuesday
Night
Tuesday Night: Mostly Clear
Mostly Clear
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
Thursday
Night
Thursday Night: Mostly Clear
Mostly Clear
 
Lo 69 °F Lo 67 °F Lo 66 °F Lo 64 °F Lo 63 °F Lo 64 °F Lo 66 °F  

 

Tonight
 
 Patchy fog after 5am. Partly cloudy, with a low around 69. South wind around 5 mph.
Saturday
 
 Patchy fog before 11am. Mostly sunny, with a high near 84. South wind 5 to 10 mph.
Saturday Night
 
 Patchy fog after 5am. Partly cloudy, with a low around 67. South wind 0 to 10 mph.
Sunday
 
 Patchy fog before 11am. Mostly sunny, with a high near 81. South wind 5 to 10 mph.
Sunday Night
 
 Mostly clear, with a low around 66. South wind 0 to 5 mph.
Monday
 
 Sunny, with a high near 80.
Monday Night
 
 Mostly clear, with a low around 64.
Tuesday
 
 Sunny, with a high near 78.
Tuesday Night
 
 Mostly clear, with a low around 63.
Wednesday
 
 Sunny, with a high near 80.
Wednesday Night
 
 Mostly clear, with a low around 64.
Thursday
 
 Sunny, with a high near 84.
Thursday Night
 
 Mostly clear, with a low around 66.
Friday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Costa Mesa, CA.