South Mountain Reservoir Weather Forecast

    • 50
    • 84

    Slight Chance Thunderstorms

    • 49
    • 84

    Partly Sunny

    • 49
    • 84

    Partly Sunny

    • 47
    • 82

    Partly Sunny

    • 46
    • 82

    Mostly Sunny

    • 43
    • 79

    Mostly Sunny

Today 24 Aug Modoc County

Partly cloudy. Haze and patchy smoke through the day. A 20 percent chance of Thunderstorms in the afternoon. Highs in the lower 80s to lower 90s. Southeast Winds around 5 Mph increasing to southwest 15 to 20 Mph in the late morning and afternoon.

Tonight 24 Aug Modoc County

Mostly clear. Slight chance of Thunderstorms in the evening. Lows in the lower to mid 50s. Southwest Winds around 15 Mph becoming south around 5 Mph in the late evening and early Morning, then shifting to the southeast 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

    70.2 °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