Weather WorldL A Times Costa Mesa, CA Weather Forecast
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L A Times Costa Mesa Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  |  | | | | | |  | | |
| Mostly Cloudy | Partly Cloudy | Partly Cloudy | Patchy Fog | Patchy Fog | Patchy Fog | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear |
| Hi: 81°FHi: 27°C | Lo: 64°FLo: 18°C | Hi: 83°FHi: 28°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 66°FLo: 19°C | Hi: 85°FHi: 29°C | Lo: 67°FLo: 19°C | Hi: 92°FHi: 33°C | Lo: 67°FLo: 19°C | Hi: 91°FHi: 33°C | Lo: 67°FLo: 19°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1210 AM PDT Sat Aug 15 2026 
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L A Times Costa Mesa Forecast Discussion
Issued: 439 AM PDT Sat Aug 15 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Marine layer low clouds have spread into parts of the valleys this morning with otherwise mostly clear skies. Low clouds will continue to move into the inland valleys through sunrise, then retreat to the coast by late morning. Mid-level flow turns slightly more southerly today, bringing a margi...