South Mountain Reservoir Weather Forecast

    • 39
    • 63

    Increasing Clouds

    • 32
    • 48

    Rain

    • 31
    • 44

    Mostly Cloudy

    • 31
    • 43

    Rain

    • 24
    • 39

    Chance Rain/Snow

    • 25
    • 40

    Mostly Cloudy

    • 25
    • 38

    Snow Likely

Today 12 Nov Modoc County

Mostly cloudy. Chance of snow in the Morning, then chance of rain and snow in the afternoon. Highs in the mid 30s to lower 40s.

Tonight 12 Nov Modoc County

Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. A 10 percent chance of rain well after midnight. Lows in the mid 30s to lower 40s. South Winds 10 to 20 Mph. Gusts up to 35 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 2 November, 2026

    20.6 °F

  • Average November

    44.7 °F

  • Highest 7 November, 2026

    70.6 °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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