South Mountain Reservoir Weather Forecast

    • 51
    • 84

    Increasing Clouds

    • 50
    • 83

    Partly Sunny

    • 48
    • 79

    Partly Sunny

    • 46
    • 80

    Mostly Sunny

    • 45
    • 80

    Mostly Sunny

    • 43
    • 78

    Mostly Sunny

Today 26 Aug Modoc County

Partly cloudy in the morning then clearing. Highs in the lower 80s to lower 90s. South Winds 10 to 15 Mph shifting to the southwest 10 to 20 Mph in the afternoon.

Tonight 26 Aug Modoc County

Mostly cloudy. Lows in the lower to mid 50s. Southwest Winds 10 to 15 Mph shifting to the southeast around 5 Mph well 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 16 August, 2026

    38.6 °F

  • Average August

    69.8 °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