Grass Valley Lake Weather Forecast

    • 47
    • 64

    Sunny

    • 50
    • 66

    Sunny

    • 52
    • 69

    Sunny

    • 53
    • 70

    Mostly Sunny

    • 54
    • 70

    Partly Sunny

    • 49
    • 65

    Mostly Cloudy

Today 6 Nov San Bernardino County Mountains

Sunny. Highs 58 to 67 above 6000 feet to 63 to 71 below 6000 feet. Areas of Winds northwest 10 to 15 Mph with Gusts to 25 Mph.

Tonight 6 Nov San Bernardino County Mountains

Clear. Lows 34 to 44 above 6000 feet to 45 to 52 below 6000 feet. Areas of Winds northwest 10 Mph.

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Grass Valley Lake Temperature Statistics

November Temperature

San Bernardino Intl. Airport (11.8 miles)

  • Lowest 4 November, 2025

    48.2 °F

  • Average November

    63 °F

  • Highest 1 November, 2025

    89.6 °F

Climate (2020–Present)

San Bernardino Intl. Airport (11.8 miles)

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  • Average Low 2020–2025

    54 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    80.2 °F
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