William R Mason Regional Park Weather Forecast

    • 70
    • 89

    Increasing Clouds

    • 68
    • 84

    Partly Sunny

    • 65
    • 79

    Mostly Sunny

    • 70
    • 87

    Mostly Sunny

    • 70
    • 89

    Mostly Sunny

    • 69
    • 89

    Partly Sunny

Today 26 Sep Orange County Coastal

Partly cloudy in the morning. Becoming mostly sunny. Highs 81 to 85 at the Beaches to 86 to 91 farther inland and near higher coastal Terrain.

Tonight 26 Sep Orange County Coastal

Partly cloudy this evening. Becoming mostly cloudy. Lows around 70. Areas of Winds southwest 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

    76.3 °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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