Rio Vista Park Weather Forecast

    • 70
    • 83

    Rain Showers Likely

    • 67
    • 82

    Slight Chance Thunderstorms

    • 67
    • 84

    Partly Sunny

    • 68
    • 88

    Partly Sunny

    • 70
    • 90

    Partly Sunny

    • 69
    • 89

    Mostly Sunny

Today 18 Sep Orange County Inland

Mostly cloudy in the morning. Becoming partly cloudy. Showers likely and a slight chance of Thunderstorms. Highs 83 to 86. Areas of Winds south to 10 Mph. Chance of measurable precipitation 70 percent.

Tonight 18 Sep Orange County Inland

Partly cloudy with a slight chance of Thunderstorms. A chance of Showers. Lows 64 to 69. Areas of Winds south 10 Mph in the evening becoming light. Chance of measurable precipitation 40 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rio Vista Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (6.8 miles)

  • Lowest 11 September, 2025

    64.9 °F

  • Average September

    74.4 °F

  • Highest 2 September, 2025

    97 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    56.7 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.7 °F
Get WillyWeather+ to remove ads