South Mountain Reservoir Weather Forecast

    • 38
    • 74

    Partly Sunny

    • 37
    • 72

    Becoming Sunny

    • 38
    • 70

    Mostly Sunny

    • 35
    • 60

    Mostly Cloudy

    • 34
    • 56

    Chance Rain

    • 34
    • 57

    Chance Rain

    • 31
    • 54

    Slight Chance Rain

Today 16 Oct Modoc County

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

Tonight 16 Oct Modoc County

Partly cloudy this evening then clearing. Lows in the mid 30s to mid 40s. South Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    55.8 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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