Mission Viejo Weather Forecast

    • 62
    • 80

    Increasing Clouds

    • 61
    • 77

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 60
    • 79

    Patchy Fog

    • 61
    • 80

    Patchy Fog

    • 61
    • 80

    Patchy Fog

    • 60
    • 82

    Mostly Sunny

Today 9 Sep Orange County Inland

Partly cloudy with patchy fog this morning. Becoming sunny. Highs around 80. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 9 Sep Orange County Inland

Partly cloudy in the evening. Becoming cloudy overnight with patchy fog. Lows 57 to 64. Areas of Winds southwest 10 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mission Viejo Temperature Statistics

September Temperature

John Wayne-Orange County Airport (12.4 miles)

  • Lowest 5 September, 2025

    66.9 °F

  • Average September

    74.7 °F

  • Highest 3 September, 2025

    86 °F

Climate (2020–Present)

John Wayne-Orange County Airport (12.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.7 °F

  • Average High 2020–2025

    73.6 °F
Get WillyWeather+ to remove ads