Mission Viejo Weather Forecast

    • 64
    • 78

    Increasing Clouds

    • 63
    • 76

    Partly Sunny

    • 64
    • 78

    Mostly Sunny

    • 66
    • 85

    Mostly Sunny

    • 67
    • 88

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

Today 20 Sep Orange County Inland

Cloudy in the morning. Becoming partly cloudy. Highs 77 to 81. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 20 Sep Orange County Inland

Mostly cloudy. Lows 59 to 66. Areas of Winds south 10 Mph in the evening becoming light.

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  • Temperature Real-Time

Mission Viejo Temperature Statistics

September Temperature

John Wayne-Orange County Airport (12.4 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 (12.4 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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