National Weather Service Forecast for: Costa Mesa CA
Issued by: National Weather Service San Diego, CA
Updated: 11:23 am PDT May 4, 2026
 
This
Afternoon
This Afternoon: Partly sunny, with a high near 66. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Partly Sunny
 Tonight

Tonight: A chance of showers after 11pm. Mostly cloudy, with a low around 54. West wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Tuesday

Tuesday: Mostly sunny, with a high near 67. West wind 5 to 15 mph, with gusts as high as 20 mph.
Mostly Sunny
 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 54. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Partly Cloudy
 Wednesday

Wednesday: Mostly sunny, with a high near 70. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Mostly Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 55.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 74.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 57.
Mostly Clear
 Friday

Friday: Mostly sunny, with a high near 75.
Mostly Sunny
Hi 66 °F Lo 54 °F Hi 67 °F Lo 54 °F Hi 70 °F Lo 55 °F Hi 74 °F Lo 57 °F Hi 75 °F

 

This Afternoon
 
 Partly sunny, with a high near 66. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
 
 A chance of showers after 11pm. Mostly cloudy, with a low around 54. West wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Mostly sunny, with a high near 67. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Partly cloudy, with a low around 54. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Wednesday
 
 Mostly sunny, with a high near 70. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 55.
Thursday
 
 Sunny, with a high near 74.
Thursday Night
 
 Mostly clear, with a low around 57.
Friday
 
 Mostly sunny, with a high near 75.
Friday Night
 
 Mostly clear, with a low around 58.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 59.
Sunday
 
 Sunny, with a high near 78.

 

Forecast from NOAA-NWS for Costa Mesa CA.