South Mountain Reservoir Weather Forecast

    • 34
    • 50

    Mostly Cloudy

    • 33
    • 48

    Rain/Snow Likely

    • 27
    • 43

    Partly Sunny

    • 34
    • 50

    Mostly Cloudy

    • 32
    • 51

    Partly Sunny

    • 32
    • 50

    Partly Sunny

Today 30 Oct Modoc County

Mostly cloudy. Highs in the mid 40s to mid 50s. Southwest Winds 10 to 15 Mph.

Tonight 30 Oct Modoc County

Mostly cloudy. Lows in the mid 30s. South Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    50.8 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.9 °F
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