South Mountain Reservoir Weather Forecast

    • 31
    • 50

    Increasing Clouds

    • 29
    • 50

    Mostly Sunny

    • 32
    • 57

    Partly Sunny

    • 34
    • 63

    Partly Sunny

    • 34
    • 59

    Mostly Cloudy

    • 33
    • 57

    Partly Sunny

Today 4 Nov Modoc County

Partly cloudy then becoming sunny late this morning then becoming partly cloudy then becoming mostly cloudy late this afternoon. Highs in the lower to mid 50s. East Winds around 5 Mph shifting to the southeast late this Morning, then shifting to the southwest early this afternoon shifting to the northwest late this afternoon.

Tonight 4 Nov Modoc County

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower to mid 30s. Northwest Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 1 November, 2026

    24.1 °F

  • Average November

    40.1 °F

  • Highest 2 November, 2026

    55.9 °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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