| National Weather Service Forecast for:
Costa Mesa CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:34 am PDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Mostly clear, with a low around 68. Calm wind. |
| Thursday |
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 82. Light and variable wind becoming south 5 to 10 mph in the morning. |
| Thursday Night |
Partly cloudy, with a low around 68. Southwest wind around 5 mph becoming calm in the evening. |
| Friday |
Mostly sunny, with a high near 82. Light south wind becoming southwest 5 to 10 mph in the morning. |
| Friday Night |
Mostly clear, with a low around 68. South wind around 5 mph becoming calm in the evening. |
| Saturday |
Sunny, with a high near 83. |
| Saturday Night |
Mostly clear, with a low around 69. |
| Sunday |
Sunny, with a high near 83. |
| Sunday Night |
Mostly clear, with a low around 69. |
| Monday |
Sunny, with a high near 84. |
| Monday Night |
Mostly clear, with a low around 69. |
| Tuesday |
Sunny, with a high near 85. |
| Tuesday Night |
Mostly clear, with a low around 70. |
| Wednesday |
Sunny, with a high near 84. |
Forecast from NOAA-NWS for Costa Mesa CA.
