South Mountain Reservoir Weather Forecast

    • 28
    • 56

    Increasing Clouds

    • 34
    • 58

    Mostly Cloudy

    • 26
    • 50

    Chance Rain

    • 28
    • 51

    Partly Sunny

    • 30
    • 54

    Partly Sunny

    • 30
    • 52

    Partly Sunny

Today 24 Oct Modoc County

Sunny. Highs in the mid 50s to lower 60s. East Winds around 5 Mph shifting to the southeast this afternoon.

Tonight 24 Oct Modoc County

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 20s to lower 30s. Southeast 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

    54.8 °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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