Grass Valley Weather Forecast

    • 55
    • 78

    Sunny

    • 57
    • 84

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 54
    • 75

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

    • 49
    • 71

    Partly Sunny

    • 52
    • 75

    Mostly Sunny

Today 22 Sep Northern Motherlode Between 1000-3000 ft

Sunny. Highs 77 to 83. Light Winds.

Tonight 22 Sep Northern Motherlode Between 1000-3000 ft

Clear. Lows 54 to 60. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Valley Temperature Statistics

September Temperature

Nevada County Air Park (3.1 miles)

  • Lowest 17 September, 2026

    46.4 °F

  • Average September

    66.7 °F

  • Highest 9 September, 2026

    91.4 °F

Climate (2021–2026)

Nevada County Air Park (3.1 miles)

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  • Average Low 2021–2026

    52.1 °F

  • Average 2021–2026

    60.1 °F

  • Average High 2021–2026

    68.4 °F
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