South Mountain Reservoir Weather Forecast

    • 36
    • 66

    Mostly Sunny

    • 36
    • 71

    Sunny

    • 36
    • 74

    Mostly Sunny

    • 36
    • 72

    Mostly Sunny

    • 35
    • 69

    Mostly Sunny

    • 33
    • 57

    Partly Sunny

    • 30
    • 52

    Partly Sunny

Today 14 Oct Modoc County

Partly cloudy in the morning then becoming sunny. Highs in the lower 50s to lower 60s.

Tonight 14 Oct Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. Northeast 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

    57.4 °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

    64.8 °F
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