South Mountain Reservoir Weather Forecast

    • 39
    • 75

    Mostly Sunny

    • 47
    • 76

    Sunny

    • 44
    • 81

    Mostly Sunny

    • 40
    • 69

    Mostly Sunny

    • 41
    • 67

    Mostly Cloudy

    • 38
    • 66

    Chance Rain

Today 29 Aug Modoc County

Sunny. Highs in the lower 70s to lower 80s. Southwest Winds 5 to 10 Mph shifting to the west 10 to 20 Mph this afternoon.

Tonight 29 Aug Modoc County

Clear. Lows in the mid 30s to lower 40s. Northwest Winds 10 to 20 Mph shifting to the north 5 to 10 Mph 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

    70 °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