Grass Valley Reservoir Weather Forecast

    • 60
    • 83

    Rain Showers

    • 60
    • 86

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

    • 63
    • 94

    Mostly Sunny

    • 63
    • 91

    Sunny

    • 64
    • 90

    Mostly Sunny

    • 63
    • 90

    Mostly Sunny

Today 29 Jul Southern Mountains

Mostly cloudy. Numerous rain Showers and isolated Thunderstorms in the Morning, then numerous rain Showers and scattered Thunderstorms in the afternoon. Highs around 70. Chance of precipitation 60 percent.

Tonight 29 Jul Southern Mountains

Mostly clear. A 20 percent chance of Showers and Thunderstorms in the evening. Lows in the lower 50s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Valley Reservoir Temperature Statistics

July Temperature

St George Municipal Airport (25.5 miles)

  • Lowest 1 July, 2026

    66.9 °F

  • Average July

    90.7 °F

  • Highest 25 July, 2026

    109 °F

Climate (2021–2026)

St George Municipal Airport (25.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    52.9 °F

  • Average 2021–2026

    64.8 °F

  • Average High 2021–2026

    76.8 °F
Get WillyWeather+ to remove ads