Rio Vista Park Weather Forecast

    • 60
    • 82

    Increasing Clouds

    • 60
    • 80

    Increasing Clouds

    • 60
    • 77

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 60
    • 80

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 59
    • 77

    Partly Sunny

Today 31 May Orange County Inland

Partly cloudy in the morning. Becoming mostly sunny. Highs 76 to 79 towards the coast to 80 to 83 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 31 May Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 55 to 60. Areas of Winds southwest to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rio Vista Park Temperature Statistics

May Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 6 May, 2026

    55.7 °F

  • Average May

    67.5 °F

  • Highest 19 May, 2026

    89.7 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.4 °F

  • Average High 2021–2026

    76.8 °F
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