Grass Valley Reservoir Weather Forecast

    • 38
    • 67

    Becoming Sunny

    • 33
    • 53

    Mostly Sunny

    • 37
    • 59

    Mostly Sunny

    • 38
    • 60

    Partly Sunny

    • 37
    • 59

    Chance Rain/Snow

    • 35
    • 53

    Chance Rain/Snow

Today 21 Apr Southern Mountains

Partly cloudy in the morning then clearing. Breezy. Highs in the upper 50s. South Winds 15 to 25 Mph late morning through afternoon.

Tonight 21 Apr Southern Mountains

Windy. Mostly clear. Lows in the lower 30s. Southwest Winds 20 to 30 Mph.

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Grass Valley Reservoir Temperature Statistics

April Temperature

St George Municipal Airport (25.5 miles)

  • Lowest 18 April, 2026

    41 °F

  • Average April

    64.5 °F

  • Highest 8 April, 2026

    87.1 °F

Climate (2021–Present)

St George Municipal Airport (25.5 miles)

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  • Average Low 2021–2026

    52.9 °F

  • Average 2021–2026

    64.8 °F

  • Average High 2021–2026

    76.9 °F
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