South Mountain Reservoir Weather Forecast

    • 35
    • 70

    Sunny

    • 37
    • 74

    Mostly Sunny

    • 36
    • 72

    Mostly Sunny

    • 36
    • 69

    Mostly Sunny

    • 32
    • 58

    Partly Sunny

    • 31
    • 51

    Partly Sunny

    • 31
    • 51

    Mostly Sunny

Today 15 Oct Modoc County

Partly cloudy with a slight chance of rain and snow in the Morning, then sunny with a slight chance of rain in the afternoon. Highs in the lower to mid 50s.

Tonight 15 Oct Modoc County

Clear. Lows in the mid 30s to lower 40s. East Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    18 °F

  • Average October

    56.1 °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

    64.8 °F
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