Mission Viejo Weather Forecast

    • 66
    • 88

    Increasing Clouds

    • 66
    • 87

    Mostly Sunny

    • 66
    • 87

    Patchy Fog

    • 67
    • 88

    Mostly Sunny

    • 67
    • 89

    Mostly Sunny

    • 67
    • 88

    Mostly Sunny

Today 3 Aug Orange County Inland

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 82 to 85 towards the coast to 90 farther inland. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 3 Aug Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 62 to 68. Areas of Winds south 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mission Viejo Temperature Statistics

August Temperature

John Wayne-Orange County Airport (12.4 miles)

  • Lowest 1 August, 2026

    70 °F

  • Average August

    74.4 °F

  • Highest 1 August, 2026

    81 °F

Climate (2021–2026)

John Wayne-Orange County Airport (12.4 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    66 °F

  • Average High 2021–2026

    73.7 °F
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