William R Mason Regional Park Weather Forecast

    • 66
    • 78

    Increasing Clouds

    • 65
    • 76

    Decreasing Clouds

    • 66
    • 77

    Mostly Sunny

    • 67
    • 84

    Mostly Sunny

    • 68
    • 85

    Mostly Sunny

    • 68
    • 86

    Partly Sunny

    • 68
    • 85

    Partly Sunny

Today 20 Sep Orange County Coastal

Partly cloudy. Highs around 80 at the Beaches to 80 to 84 farther inland and near higher coastal Terrain.

Tonight 20 Sep Orange County Coastal

Partly cloudy this evening. Becoming mostly cloudy. Lows 62 to 66. Areas of Winds south 10 Mph this evening becoming light.

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William R Mason Regional Park Temperature Statistics

September Temperature

John Wayne-Orange County Airport (2.5 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    77.1 °F

  • Highest 9 September, 2026

    102.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (2.5 miles)

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  • Average Low 2021–2026

    59.1 °F

  • Average 2021–2026

    66.2 °F

  • Average High 2021–2026

    73.8 °F
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