Rio Vista Park Weather Forecast

    • 72
    • 83

    Rain Showers

    • 73
    • 92

    Becoming Sunny

    • 74
    • 93

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 72
    • 93

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 67
    • 85

    Mostly Sunny

Today 6 Sep Orange County Inland

Cloudy with Showers likely this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs 82 to 85. Areas of Winds northeast to 10 Mph. Chance of measurable precipitation 70 percent.

Tonight 6 Sep Orange County Inland

Partly cloudy. Lows 67 to 72. Light Winds.

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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

    74 °F

  • Highest 1 September, 2026

    85.6 °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

    66.6 °F

  • Average High 2021–2026

    76.9 °F
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