Grass Valley Weather Forecast

    • 45
    • 64

    Decreasing Clouds

    • 49
    • 62

    Rain Showers

    • 45
    • 56

    Rain Showers

    • 46
    • 59

    Rain Showers Likely

    • 47
    • 53

    Rain Showers

    • 47
    • 53

    Rain Showers

    • 46
    • 52

    Rain Showers

Today 15 Dec Motherlode

Patchy dense fog early in the morning. Areas of dense fog. Locally dense late in the Morning, then patchy dense fog early in the afternoon. Partly cloudy. Highs 56 to 68. Light Winds.

Tonight 15 Dec Motherlode

Partly cloudy. Patchy fog after midnight. Lows 40 to 52. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Valley Temperature Statistics

December Temperature

Nevada County Air Park (3.1 miles)

  • Lowest 4 December, 2025

    39.2 °F

  • Average December

    55.4 °F

  • Highest 11 December, 2025

    71.6 °F

Climate (2020–Present)

Nevada County Air Park (3.1 miles)

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  • Average Low 2020–2025

    51.9 °F

  • Average 2020–2025

    60.3 °F

  • Average High 2020–2025

    68.6 °F
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