South Mountain Reservoir Weather Forecast

    • 44
    • 68

    Rain Showers Likely

    • 32
    • 54

    Rain Showers

    • 26
    • 51

    Mostly Sunny

    • 30
    • 58

    Mostly Sunny

    • 31
    • 59

    Partly Sunny

    • 29
    • 55

    Partly Sunny

    • 29
    • 55

    Partly Sunny

Today 21 Oct Modoc County

Partly cloudy. Highs in the mid 50s to lower 60s.

Tonight 21 Oct Modoc County

Mostly cloudy. Slight chance of Thunderstorms this evening. Showers likely through the night. Lows in the lower to mid 40s. East Winds around 5 Mph. Chance of precipitation 60 percent.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    55.2 °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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