Rio Vista Park Weather Forecast

    • 65
    • 81

    Mostly Cloudy

    • 64
    • 78

    Decreasing Clouds

    • 66
    • 80

    Partly Sunny

    • 68
    • 87

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 68
    • 89

    Mostly Sunny

    • 68
    • 88

    Partly Sunny

Today 20 Sep Orange County Inland

Partly cloudy. Highs 83 to 86.

Tonight 20 Sep Orange County Inland

Partly cloudy this evening. Becoming mostly cloudy. Lows 59 to 66. Areas of Winds south 10 Mph this evening becoming light.

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Rio Vista Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    78.4 °F

  • Highest 9 September, 2026

    108.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    76.9 °F
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