South Mountain Reservoir Weather Forecast

    • 47
    • 76

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 49
    • 82

    Partly Sunny

    • 46
    • 76

    Mostly Sunny

    • 37
    • 64

    Mostly Sunny

    • 41
    • 61

    Mostly Sunny

    • 44
    • 67

    Mostly Sunny

Today 8 Sep Modoc County

Sunny. Highs in the mid 70s to lower 80s. Northeast Winds around 5 Mph shifting to the south this afternoon.

Tonight 8 Sep Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. Northeast Winds 5 to 10 Mph shifting to the east after midnight.

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South Mountain Reservoir Temperature Statistics

September Temperature

Alturas (22.4 miles)

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  • Average September

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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

    64.7 °F
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