South Mountain Reservoir Weather Forecast

    • 55
    • 83

    Sunny

    • 54
    • 84

    Sunny

    • 47
    • 86

    Sunny

    • 44
    • 82

    Mostly Sunny

    • 35
    • 67

    Mostly Sunny

    • 30
    • 56

    Mostly Sunny

Today 6 Oct Modoc County

Sunny. Highs in the lower to mid 80s. East Winds around 5 Mph shifting to the northwest late in the afternoon.

Tonight 6 Oct Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. North Winds around 5 Mph shifting to the east after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    69.8 °F

  • Highest 3 October, 2026

    89.1 °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

    64.7 °F
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