South Mountain Reservoir Weather Forecast

    • 44
    • 79

    Becoming Sunny

    • 39
    • 74

    Mostly Sunny

    • 46
    • 76

    Sunny

    • 45
    • 79

    Mostly Sunny

    • 40
    • 71

    Partly Sunny

    • 40
    • 68

    Partly Sunny

Today 28 Aug Modoc County

Mostly cloudy. Slight chance of Thunderstorms this afternoon. Highs in the mid 70s to lower 80s. South Winds 15 to 20 Mph shifting to the southwest late this afternoon.

Tonight 28 Aug Modoc County

Mostly clear. Slight chance of Thunderstorms in the evening. Lows in the mid 40s to lower 50s. Southwest Winds 10 to 20 Mph shifting to the south 5 to 10 Mph late in the evening and overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 16 August, 2026

    38.6 °F

  • Average August

    69.7 °F

  • Highest 7 August, 2026

    101.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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

  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.8 °F
Get WillyWeather+ to remove ads