NWS Forecast for Costa Mesa CA

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

Updated: 5:33 am PDT Oct 6, 2026

Today Sunny	Tonight Mostly Clear	Wednesday Sunny	Wednesday Night Mostly Clear	Thursday Patchy Fog then Sunny	Thursday Night Increasing Clouds	Friday Patchy Fog then Sunny	Friday Night Mostly Clear	Saturday Mostly Sunny
Hi 93 °F	Lo 71 °F	Hi 89 °F	Lo 69 °F	Hi 88 °F	Lo 68 °F	Hi 86 °F	Lo 67 °F	Hi 81 °F

Extreme Heat Warning
Beach Hazards Statement
Coastal Flood Advisory

Today	Sunny, with a high near 93. South wind 5 to 10 mph.
Tonight	Mostly clear, with a low around 71. Southwest wind around 5 mph becoming southeast after midnight.
Wednesday	Sunny, with a high near 89. Light west wind becoming southwest 5 to 10 mph in the afternoon.
Wednesday Night	Mostly clear, with a low around 69. Southwest wind around 5 mph becoming calm after midnight.
Thursday	Patchy fog before 11am. Otherwise, sunny, with a high near 88. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Thursday Night	Increasing clouds, with a low around 68.
Friday	Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86.
Friday Night	Mostly clear, with a low around 67.
Saturday	Mostly sunny, with a high near 81.
Saturday Night	Partly cloudy, with a low around 65.
Sunday	A slight chance of showers. Partly sunny, with a high near 77.
Sunday Night	A slight chance of showers. Partly cloudy, with a low around 62.
Columbus Day	A slight chance of showers. Mostly sunny, with a high near 75.

Forecast from NOAA-NWS for Costa Mesa CA.