South Mountain Reservoir Weather Forecast

    • 35
    • 55

    Decreasing Clouds

    • 34
    • 61

    Partly Sunny

    • 35
    • 66

    Partly Sunny

    • 37
    • 62

    Partly Sunny

    • 35
    • 51

    Chance Rain

    • 33
    • 47

    Rain/Snow

    • 27
    • 42

    Rain/Snow Likely

Today 9 Nov Modoc County

Mostly cloudy. Slight chance of snow in the Morning, then slight chance of rain and snow in the afternoon. Highs around 40.

Tonight 9 Nov Modoc County

Mostly clear this evening then becoming partly cloudy. Lows in the mid 30s to lower 40s. South Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 2 November, 2026

    20.6 °F

  • Average November

    42.2 °F

  • Highest 7 November, 2026

    69.1 °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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