South Mountain Reservoir Weather Forecast

    • 26
    • 49

    Becoming Sunny

    • 29
    • 52

    Mostly Cloudy

    • 29
    • 49

    Partly Sunny

    • 26
    • 47

    Chance Rain

    • 25
    • 46

    Mostly Sunny

    • 30
    • 52

    Mostly Cloudy

Today 28 Oct Modoc County

Partly cloudy early this morning then clearing. Highs in the lower to mid 50s. East Winds around 5 Mph shifting to the west this afternoon.

Tonight 28 Oct Modoc County

Mostly clear. Lows in the mid 20s to lower 30s. North Winds 5 to 10 Mph shifting to the northeast well after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    52.4 °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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