Grass Valley Lake Weather Forecast

    • 43
    • 55

    Rain Showers

    • 39
    • 48

    Rain Showers

    • 42
    • 55

    Mostly Sunny

    • 47
    • 61

    Sunny

    • 51
    • 65

    Sunny

    • 52
    • 67

    Sunny

    • 51
    • 67

    Sunny

Today 11 Oct San Bernardino County Mountains

Sunny. Highs 56 to 66 above 6000 feet to 67 to 75 below 6000 feet.

Tonight 11 Oct San Bernardino County Mountains

Partly cloudy this evening. Becoming mostly cloudy. Showers, Colder. Lows 28 to 38 above 6000 feet to 39 to 48 below 6000 feet. Areas of Winds south 20 to 30 Mph with Gusts to 45 Mph.

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  • Temperature Real-Time

Grass Valley Lake Temperature Statistics

October Temperature

San Bernardino Intl. Airport (11.8 miles)

  • Lowest 1 October, 2026

    60.8 °F

  • Average October

    80.6 °F

  • Highest 2 October, 2026

    104 °F

Climate (2021–2026)

San Bernardino Intl. Airport (11.8 miles)

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    63.3 °F

  • Average High 2021–2026

    80.4 °F
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