Rio Vista Park Weather Forecast

    • 65
    • 80

    Increasing Clouds

    • 65
    • 84

    Partly Sunny

    • 64
    • 86

    Mostly Sunny

    • 68
    • 87

    Mostly Sunny

    • 69
    • 89

    Patchy Fog

    • 69
    • 89

    Partly Sunny

Today 13 Sep Orange County Inland

Mostly cloudy with patchy fog this morning. Becoming sunny. Highs 77 to 81. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 13 Sep Orange County Inland

Mostly clear in the evening. Becoming mostly cloudy overnight with patchy fog. Lows 58 to 65. Light Winds.

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Rio Vista Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 11 September, 2025

    64.9 °F

  • Average September

    75.5 °F

  • Highest 2 September, 2025

    97 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.8 miles)

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  • Average Low 2020–2025

    56.7 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.7 °F
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