South Mountain Reservoir Weather Forecast

    • 52
    • 88

    Areas Smoke

    • 59
    • 89

    Areas Smoke

    • 57
    • 85

    Mostly Cloudy

    • 56
    • 86

    Mostly Cloudy

    • 55
    • 88

    Slight Chance Thunderstorms

    • 53
    • 88

    Mostly Sunny

    • 52
    • 86

    Mostly Sunny

Today 18 Jul Modoc County

Partly cloudy early this morning then becoming sunny. Highs in the mid 80s to lower 90s. South Winds 5 to 10 Mph shifting to the southwest 10 to 15 Mph late this afternoon.

Tonight 18 Jul Modoc County

Mostly clear. Haze after midnight. Smoke well after midnight. Lows in the lower to mid 50s. West Winds 10 to 20 Mph shifting to the southwest 5 to 10 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    69.5 °F

  • Highest 11 July, 2026

    95.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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

  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.7 °F
Get WillyWeather+ to remove ads