South Mountain Reservoir Weather Forecast

    • 36
    • 68

    Increasing Clouds

    • 34
    • 67

    Partly Sunny

    • 41
    • 63

    Partly Sunny

    • 39
    • 59

    Rain

    • 33
    • 48

    Rain/Snow Likely

    • 30
    • 43

    Chance Snow

Today 21 Oct Modoc County

Sunny. Highs in the mid 60s to lower 70s. East Winds around 5 Mph shifting to the south late this afternoon.

Tonight 21 Oct Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. South Winds 5 to 10 Mph shifting to the southeast well after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 16 October, 2025

    24.1 °F

  • Average October

    49.4 °F

  • Highest 7 October, 2025

    73 °F

Climate (2020–Present)

Alturas (22.4 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    49.1 °F

  • Average High 2020–2025

    64.3 °F
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