Rio Vista Park Weather Forecast

    • 54
    • 69

    Mostly Cloudy

    • 58
    • 66

    Rain Showers

    • 55
    • 64

    Rain Showers

    • 53
    • 65

    Rain Showers

    • 47
    • 63

    Rain Showers

    • 47
    • 64

    Chance Rain Showers

Today 22 Dec Orange County Inland

Cloudy this morning. Becoming mostly cloudy. Areas of fog this morning. Local visibility one quarter mile or less at Times this morning. Highs around 67 towards the coast to 70 farther inland. Light Winds.

Tonight 22 Dec Orange County Inland

Cloudy. Lows 51 to 54. Light Winds.

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Rio Vista Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    60.7 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.8 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.4 °F
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