South Mountain Reservoir Weather Forecast

    • 29
    • 50

    Mostly Sunny

    • 30
    • 56

    Mostly Sunny

    • 32
    • 59

    Partly Sunny

    • 27
    • 53

    Partly Sunny

    • 27
    • 51

    Mostly Sunny

    • 30
    • 54

    Partly Sunny

Today 23 Oct Modoc County

Sunny. Highs in the mid 40s to mid 50s. North Winds 10 to 15 Mph.

Tonight 23 Oct Modoc County

Clear. Lows in the lower to mid 20s. Northeast 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

    54.6 °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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