William R Mason Regional Park Weather Forecast

    • 66
    • 80

    Increasing Clouds

    • 66
    • 78

    Mostly Cloudy

    • 65
    • 76

    Partly Sunny

    • 66
    • 77

    Mostly Sunny

    • 66
    • 81

    Mostly Sunny

    • 67
    • 83

    Partly Sunny

Today 19 Sep Orange County Coastal

Partly cloudy. Highs around 80 at the Beaches to 82 to 87 farther inland and near higher coastal Terrain.

Tonight 19 Sep Orange County Coastal

Mostly clear this evening. Becoming mostly cloudy. Lows 63 to 67. Areas of Winds west to 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

    77.3 °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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