Costa Mesa Weather Forecast

    • 60
    • 72

    Increasing Clouds

    • 61
    • 73

    Partly Sunny

    • 61
    • 74

    Mostly Cloudy

    • 61
    • 73

    Mostly Cloudy

    • 60
    • 73

    Partly Sunny

    • 60
    • 73

    Partly Sunny

Today 3 Jun Orange County Coastal

Mostly cloudy this morning. Becoming partly cloudy. Highs around 70 at the Beaches to 73 to 77 farther inland and near higher coastal Terrain. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 3 Jun Orange County Coastal

Partly cloudy in the evening. Becoming cloudy overnight with patchy fog. Lows 57 to 61. Areas of Winds south 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Costa Mesa Temperature Statistics

June Temperature

John Wayne-Orange County Airport (3.7 miles)

  • Lowest 1 June, 2026

    63 °F

  • Average June

    66 °F

  • Highest 1 June, 2026

    72 °F

Climate (2021–Present)

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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