Rio Oso Weather Forecast

    • 63
    • 96

    Increasing Clouds

    • 65
    • 87

    Chance Rain Showers

    • 62
    • 80

    Chance Rain Showers

    • 61
    • 87

    Mostly Sunny

    • 61
    • 90

    Sunny

    • 65
    • 93

    Mostly Sunny

    • 62
    • 83

    Chance Rain Showers

Today 17 Sep Southern Sacramento Valley

Sunny. Highs 94 to 100. Northwest Winds up to 10 Mph.

Tonight 17 Sep Southern Sacramento Valley

Mostly clear in the evening then becoming mostly cloudy. Lows 62 to 70. Light Winds.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rio Oso Temperature Statistics

September Temperature

Marysville, Yuba County Airport (9.3 miles)

  • Lowest 5 September, 2025

    57.9 °F

  • Average September

    74 °F

  • Highest 1 September, 2025

    102 °F

Climate (2020–Present)

Marysville, Yuba County Airport (9.3 miles)

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

  • Average Low 2020–2025

    50.8 °F

  • Average 2020–2025

    64.2 °F

  • Average High 2020–2025

    78.2 °F
Get WillyWeather+ to remove ads