National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

John Wayne-Orange County Airport (KSNA)

Lat: 33.6798°NLon: 117.8674°WElev: 39.0ft.

Clear

86°F

30°C

Humidity 23%
Wind Speed N 0 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 17 Oct 05:15 PM PDT
Extended Forecast for

Costa Mesa CA

Heat Advisory October 17, 05:44pm until October 17, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory October 17, 05:44pm until October 17, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 64. West wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Increasing
    Clouds

  • Monday

    Monday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 80. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 80 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 62. South wind around 5 mph becoming calm after midnight.

    Low: 62 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 76.

    High: 76 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 11pm. Partly cloudy, with a low around 60. Chance of precipitation is 20%.

    Low: 60 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Partly sunny, with a high near 74.

    High: 74 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 66. West wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Sunday Night
Increasing clouds, with a low around 64. West wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 80. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
Increasing clouds, with a low around 62. South wind around 5 mph becoming calm after midnight.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 76.
Tuesday Night
A slight chance of showers after 11pm. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
Wednesday
A chance of showers. Partly sunny, with a high near 74.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61.
Thursday
Showers likely, mainly before 11am. Mostly cloudy, with a high near 70.
Thursday Night
A chance of showers. Partly cloudy, with a low around 58.
Friday
Sunny, with a high near 71.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Costa Mesa CA
 33.69°N 117.92°W (Elev. 3 ft)
Last Update:
12:25 pm PDT Oct 17, 2026
Forecast Valid:
5pm PDT Oct 17, 2026-6pm PDT Oct 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation