South Mountain Reservoir Weather Forecast

    • 55
    • 83

    Sunny

    • 47
    • 83

    Sunny

    • 38
    • 77

    Mostly Sunny

    • 31
    • 60

    Chance Rain/Snow

    • 28
    • 52

    Partly Sunny

    • 31
    • 55

    Partly Sunny

Today 7 Oct Modoc County

Sunny. Highs in the lower 80s to lower 90s. Southeast Winds around 5 Mph shifting to the southwest early this Afternoon, then shifting to the west late this afternoon.

Tonight 7 Oct Modoc County

Clear. Lows in the lower 50s to lower 60s. Northwest Winds around 5 Mph shifting to the northeast late in the evening and overnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    69.1 °F

  • Highest 3 October, 2026

    89.1 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.7 °F
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