South Mountain Reservoir Weather Forecast

    • 28
    • 50

    Increasing Clouds

    • 33
    • 59

    Partly Sunny

    • 34
    • 64

    Partly Sunny

    • 34
    • 57

    Mostly Cloudy

    • 34
    • 56

    Partly Sunny

    • 36
    • 58

    Partly Sunny

    • 36
    • 59

    Mostly Cloudy

Today 5 Nov Modoc County

Sunny. Highs in the lower to mid 50s. East Winds around 5 Mph shifting to the north this afternoon.

Tonight 5 Nov Modoc County

Mostly clear. Lows in the mid 20s to lower 30s. East Winds around 5 Mph.

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South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 1 November, 2026

    23.6 °F

  • Average November

    40.8 °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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