South Mountain Reservoir Weather Forecast

    • 50
    • 82

    Becoming Sunny

    • 50
    • 84

    Sunny

    • 49
    • 85

    Sunny

    • 48
    • 85

    Sunny

    • 43
    • 80

    Mostly Sunny

    • 36
    • 65

    Mostly Sunny

Today 5 Oct Modoc County

Partly cloudy in the morning then clearing. Highs in the lower to mid 80s. North Winds around 5 Mph shifting to the northwest late in the afternoon.

Tonight 5 Oct Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. Northwest Winds around 5 Mph shifting to the northeast well after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    44.1 °F

  • Average October

    70.3 °F

  • Highest 1 October, 2026

    86 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.1 °F

  • Average High 2021–2026

    64.7 °F
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