Rio Vista Park Weather Forecast

    • 72
    • 91

    Partly Sunny

    • 74
    • 93

    Partly Sunny

    • 73
    • 95

    Mostly Sunny

    • 71
    • 91

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

    • 66
    • 85

    Mostly Sunny

Today 7 Sep Orange County Inland

Partly cloudy with a slight chance of Showers. Warmer. Highs 89 to 93. Light Winds becoming west 10 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 7 Sep Orange County Inland

Mostly clear in the evening. Becoming partly cloudy. Lows 68 to 72. Areas of Winds west to 10 Mph in the 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

    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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