Grass Valley Reservoir Weather Forecast

    • 57
    • 83

    Slight Chance Thunderstorms

    • 58
    • 84

    Mostly Sunny

    • 59
    • 87

    Sunny

    • 60
    • 87

    Mostly Sunny

    • 59
    • 85

    Mostly Sunny

    • 55
    • 81

    Sunny

Today 14 Jun Southern Mountains

Partly cloudy with a slight chance of rain Showers in the Morning, then partly sunny with a chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Highs around 70. Chance of precipitation 50 percent.

Tonight 14 Jun Southern Mountains

Mostly cloudy with a chance of rain Showers and a slight chance of Thunderstorms in the Evening, then mostly clear after midnight. Lows around 50. Chance of precipitation 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Valley Reservoir Temperature Statistics

June Temperature

St George Municipal Airport (25.5 miles)

  • Lowest 1 June, 2026

    63 °F

  • Average June

    85.4 °F

  • Highest 12 June, 2026

    102.9 °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

    76.8 °F
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