South Mountain Reservoir Weather Forecast

    • 29
    • 47

    Chance Rain/Snow

    • 25
    • 47

    Partly Sunny

    • 27
    • 50

    Partly Sunny

    • 32
    • 50

    Slight Chance Snow

    • 31
    • 46

    Slight Chance Snow

    • 29
    • 45

    Slight Chance Snow

Today 26 Oct Modoc County

Mostly cloudy with a chance of rain and snow this Morning, then partly cloudy this afternoon. Snow level 5500 feet this morning. Highs in the mid 40s to lower 50s. Southwest Winds 10 to 15 Mph. Chance of precipitation 30 percent.

Tonight 26 Oct Modoc County

Partly cloudy. Lows in the mid 20s to lower 30s. Northwest Winds 10 to 15 Mph decreasing to around 5 Mph after Midnight, then shifting to the southeast 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

    52.7 °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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