Casa De Santiago Weather Forecast

    • 65
    • 78

    Mostly Sunny

    • 66
    • 81

    Increasing Clouds

    • 66
    • 79

    Mostly Cloudy

    • 65
    • 78

    Partly Sunny

    • 66
    • 79

    Mostly Sunny

    • 68
    • 85

    Mostly Sunny

    • 69
    • 87

    Partly Sunny

Today 18 Sep Orange County Inland

Partly cloudy. Highs 86 to 90.

Tonight 18 Sep Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Lows 57 to 65. Areas of Winds west to 10 Mph this evening becoming light.

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Casa De Santiago Temperature Statistics

September Temperature

John Wayne-Orange County Airport (6.2 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    77.4 °F

  • Highest 9 September, 2026

    102.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (6.2 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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