South Mountain Reservoir Weather Forecast

    • 47
    • 80

    Mostly Sunny

    • 51
    • 82

    Partly Sunny

    • 49
    • 82

    Partly Sunny

    • 49
    • 82

    Partly Sunny

    • 50
    • 83

    Partly Sunny

    • 52
    • 84

    Mostly Sunny

Today 15 Aug Modoc County

Sunny. Highs in the mid 70s to mid 80s. South Winds 5 to 10 Mph shifting to the southwest 10 to 15 Mph late this afternoon.

Tonight 15 Aug Modoc County

Partly cloudy then becoming mostly cloudy late this evening then becoming partly cloudy then becoming mostly clear well after midnight. Lows in the mid 40s to lower 50s. Southwest Winds 5 to 10 Mph shifting to the south after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    72 °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