South Mountain Reservoir Weather Forecast

    • 43
    • 64

    Increasing Clouds

    • 36
    • 59

    Rain Likely

    • 43
    • 64

    Mostly Sunny

    • 44
    • 73

    Partly Sunny

    • 47
    • 76

    Partly Sunny

    • 47
    • 78

    Chance Rain

Today 5 Sep Modoc County

Sunny. Highs in the lower 60s to lower 70s. South Winds 5 to 10 Mph shifting to the southwest late this afternoon.

Tonight 5 Sep Modoc County

Mostly clear. Lows in the lower to mid 40s. Southwest Winds 10 to 15 Mph shifting to the south 5 to 10 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

September Temperature

Alturas (22.4 miles)

  • Lowest

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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

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.7 °F
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