Costa Mesa Weather Forecast

    • 62
    • 72

    Increasing Clouds

    • 62
    • 74

    Partly Sunny

    • 62
    • 77

    Partly Sunny

    • 62
    • 77

    Partly Sunny

    • 63
    • 76

    Partly Sunny

    • 65
    • 78

    Partly Sunny

    • 66
    • 80

    Mostly Sunny

Today 3 Jul Orange County Coastal

Mostly cloudy this morning. Becoming mostly sunny. Highs around 70 at the Beaches to 72 to 76 farther inland and near higher coastal Terrain. Areas of Winds south 10 Mph.

Tonight 3 Jul Orange County Coastal

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 59 to 64. Areas of Winds southwest 10 Mph this evening becoming light.

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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 1 July, 2025

    63 °F

  • Average July

    67.1 °F

  • Highest 1 July, 2025

    73.9 °F

Climate (2020–Present)

John Wayne-Orange County Airport (3.7 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.6 °F

  • Average High 2020–2025

    73.6 °F
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