Grass Valley Lake Weather Forecast

    • 70
    • 87

    Mostly Sunny

    • 70
    • 86

    Mostly Sunny

    • 70
    • 88

    Mostly Sunny

    • 71
    • 88

    Mostly Sunny

    • 71
    • 88

    Mostly Sunny

    • 71
    • 89

    Mostly Sunny

Today 23 Aug San Bernardino County Mountains

Mostly sunny. Highs 78 to 88 above 6000 feet to 87 to 97 below 6000 feet. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph this afternoon.

Tonight 23 Aug San Bernardino County Mountains

Mostly clear. Cooler. Lows 53 to 63 above 6000 feet to 62 to 72 below 6000 feet. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph. Becoming 25 Mph overnight.

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Grass Valley Lake Temperature Statistics

August Temperature

San Bernardino Intl. Airport (11.8 miles)

  • Lowest 15 August, 2026

    63.9 °F

  • Average August

    79.2 °F

  • Highest 19 August, 2026

    105.8 °F

Climate (2021–2026)

San Bernardino Intl. Airport (11.8 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.4 °F
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