Grass Valley Reservoir Weather Forecast

    • 34
    • 52

    Partly Sunny

    • 42
    • 60

    Partly Sunny

    • 47
    • 72

    Mostly Sunny

    • 49
    • 78

    Mostly Sunny

    • 50
    • 81

    Sunny

    • 52
    • 82

    Sunny

    • 50
    • 80

    Sunny

Today 15 Mar Southern Mountains

Sunny, Breezy, cooler. Highs around 40. Northwest Winds 15 to 25 Mph.

Tonight 15 Mar Southern Mountains

Partly cloudy. Lows in the upper 20s.

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Grass Valley Reservoir Temperature Statistics

March Temperature

St George Municipal Airport (25.5 miles)

  • Lowest 8 March, 2026

    37.9 °F

  • Average March

    57.8 °F

  • Highest 13 March, 2026

    81 °F

Climate (2021–Present)

St George Municipal Airport (25.5 miles)

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  • Average Low 2021–2026

    52.8 °F

  • Average 2021–2026

    64.6 °F

  • Average High 2021–2026

    76.7 °F
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