NWS Forecast for Costa Mesa CA

National Weather Service Forecast for: Costa Mesa CA
Issued by: National Weather Service San Diego, CA

Updated: 12:56 pm PST Dec 17, 2025

Tonight Partly Cloudy then Patchy Fog	Thursday Patchy Fog then Sunny	Thursday Night Partly Cloudy	Friday Mostly Sunny	Friday Night Partly Cloudy	Saturday Partly Sunny	Saturday Night Patchy Fog	Sunday Patchy Fog then Partly Sunny	Sunday Night Patchy Fog
Lo 51 °F	Hi 74 °F	Lo 52 °F	Hi 72 °F	Lo 52 °F	Hi 68 °F	Lo 52 °F	Hi 69 °F	Lo 52 °F

Air Quality Alert

Tonight	Patchy fog between 1am and 4am. Otherwise, partly cloudy, with a low around 51. Southeast wind around 5 mph.
Thursday	Patchy fog between 7am and 10am. Otherwise, mostly sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Thursday Night	Partly cloudy, with a low around 52. Calm wind.
Friday	Mostly sunny, with a high near 72. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night	Partly cloudy, with a low around 52. Calm wind.
Saturday	Partly sunny, with a high near 68.
Saturday Night	Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 52.
Sunday	Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69.
Sunday Night	Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 52.
Monday	Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 68.
Monday Night	Mostly cloudy, with a low around 52.
Tuesday	A slight chance of showers. Mostly cloudy, with a high near 66.
Tuesday Night	A chance of showers. Mostly cloudy, with a low around 54.
Wednesday	Showers likely. Cloudy, with a high near 67.

Forecast from NOAA-NWS for Costa Mesa CA.