Rio Vista Park Weather Forecast

    • 64
    • 80

    Increasing Clouds

    • 66
    • 82

    Mostly Sunny

    • 68
    • 85

    Mostly Sunny

    • 69
    • 88

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 68
    • 93

    Partly Sunny

Today 21 Sep Orange County Inland

Mostly cloudy this morning. Becoming mostly sunny. Highs around 80. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 21 Sep Orange County Inland

Partly cloudy in the evening. Becoming mostly cloudy. Lows 57 to 64. Areas of Winds southwest to 10 Mph in the evening becoming light.

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  • Temperature Real-Time

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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