Rio Vista Park Weather Forecast

    • 62
    • 86

    Mostly Sunny

    • 61
    • 82

    Mostly Sunny

    • 59
    • 76

    Rain Showers

    • 56
    • 71

    Chance Rain Showers

    • 57
    • 74

    Mostly Sunny

    • 59
    • 80

    Mostly Sunny

Today 19 Oct Orange County Inland

Mostly sunny. Highs 83 to 86. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 19 Oct Orange County Inland

Mostly clear. Patchy fog overnight. Local visibility one quarter mile or less at Times overnight. Lows 58 to 62. Light Winds.

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Rio Vista Park Temperature Statistics

October Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 13 October, 2026

    53.7 °F

  • Average October

    78.9 °F

  • Highest 3 October, 2026

    105.7 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    57.2 °F

  • Average 2021–2026

    66.8 °F

  • Average High 2021–2026

    77 °F
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