Grass Valley Lake Weather Forecast

    • 44
    • 64

    Mostly Sunny

    • 39
    • 60

    Mostly Sunny

    • 38
    • 61

    Sunny

    • 50
    • 67

    Sunny

    • 52
    • 74

    Sunny

    • 53
    • 74

    Sunny

    • 51
    • 73

    Mostly Sunny

Today 16 May San Bernardino County Mountains

Mostly sunny. Highs 59 to 69 above 6000 feet to 64 to 74 below 6000 feet. Areas of Winds west 10 to 20 Mph with Gusts to 35 Mph.

Tonight 16 May San Bernardino County Mountains

Mostly clear this evening. Becoming partly cloudy. Colder. Lows 34 to 44 above 6000 feet to 42 to 51 below 6000 feet. Areas of Winds west 10 to 20 Mph. Gusts to 35 Mph becoming 30 Mph overnight.

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Grass Valley Lake Temperature Statistics

May Temperature

San Bernardino Intl. Airport (11.8 miles)

  • Lowest 6 May, 2026

    49.1 °F

  • Average May

    64.4 °F

  • Highest 11 May, 2026

    98.6 °F

Climate (2021–Present)

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

    80.5 °F
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