Grass Valley Reservoir Weather Forecast

    • 21
    • 39

    Sunny

    • 24
    • 46

    Partly Sunny

    • 28
    • 47

    Sunny

    • 31
    • 50

    Mostly Sunny

    • 29
    • 51

    Sunny

    • 26
    • 52

    Sunny

    • 22
    • 43

    Sunny

Today 10 Jan Southern Mountains

Sunny. Highs around 30.

Tonight 10 Jan Southern Mountains

Mostly clear. Lows near 20.

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Grass Valley Reservoir Temperature Statistics

January Temperature

St George Municipal Airport (25.5 miles)

  • Lowest 6 January, 2026

    37 °F

  • Average January

    46.9 °F

  • Highest 4 January, 2026

    59 °F

Climate (2021–Present)

St George Municipal Airport (25.5 miles)

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  • Average Low 2021–2026

    52.6 °F

  • Average 2021–2026

    64.5 °F

  • Average High 2021–2026

    76.5 °F
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