William R Mason Regional Park Weather Forecast

    • 67
    • 84

    Mostly Cloudy

    • 64
    • 79

    Becoming Sunny

    • 67
    • 84

    Mostly Sunny

    • 67
    • 84

    Mostly Sunny

    • 69
    • 87

    Mostly Sunny

    • 72
    • 89

    Mostly Sunny

    • 73
    • 92

    Sunny

Today 27 Sep Orange County Coastal

Mostly sunny. Highs 84 to 88 at the Beaches to 89 to 93 farther inland and near higher coastal Terrain.

Tonight 27 Sep Orange County Coastal

Partly cloudy. Lows 63 to 67. 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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