Costa Mesa Weather Forecast

    • 70
    • 82

    Increasing Clouds

    • 69
    • 80

    Decreasing Clouds

    • 68
    • 77

    Partly Sunny

    • 67
    • 77

    Partly Sunny

    • 67
    • 77

    Partly Sunny

    • 67
    • 77

    Partly Sunny

    • 68
    • 78

    Partly Sunny

Today 15 Jul Orange County Coastal

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 78 to 83 at the Beaches to 82 to 87 farther inland and near higher coastal Terrain. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 15 Jul Orange County Coastal

Partly cloudy. Lows 66 to 70. Areas of Winds southwest 10 to 15 Mph becoming southeast overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Costa Mesa Temperature Statistics

July Temperature

John Wayne-Orange County Airport (3.7 miles)

  • Lowest 3 July, 2026

    62.7 °F

  • Average July

    71.3 °F

  • Highest 12 July, 2026

    81.6 °F

Climate (2021–2026)

John Wayne-Orange County Airport (3.7 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    66 °F

  • Average High 2021–2026

    73.7 °F
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