Grass Valley Weather Forecast

    • 57
    • 78

    Sunny

    • 56
    • 80

    Sunny

    • 56
    • 79

    Mostly Sunny

    • 60
    • 84

    Sunny

    • 61
    • 87

    Sunny

    • 62
    • 88

    Sunny

Today 12 Sep Motherlode

Sunny. Highs 75 to 85. Light Winds becoming west up to 10 Mph in the afternoon.

Tonight 12 Sep Motherlode

Clear. Lows 56 to 64. Light Winds.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Valley Temperature Statistics

September Temperature

Nevada County Air Park (3.1 miles)

  • Lowest 10 September, 2025

    55.4 °F

  • Average September

    72.8 °F

  • Highest 2 September, 2025

    95 °F

Climate (2020–Present)

Nevada County Air Park (3.1 miles)

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

  • Average Low 2020–2025

    52.1 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    68.8 °F
Get WillyWeather+ to remove ads