South Mountain Reservoir Weather Forecast

    • 40
    • 78

    Increasing Clouds

    • 33
    • 57

    Chance Rain/Snow

    • 28
    • 48

    Partly Sunny

    • 29
    • 51

    Chance Rain Showers

    • 31
    • 57

    Mostly Sunny

    • 33
    • 60

    Mostly Sunny

Today 9 Oct Modoc County

Sunny. Highs in the mid 70s to mid 80s. South Winds 5 to 10 Mph shifting to the west 10 to 20 Mph this afternoon.

Tonight 9 Oct Modoc County

Mostly clear. Lows around 40. Northwest Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    67.8 °F

  • Highest 3 October, 2026

    89.7 °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

    64.8 °F
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