South Mountain Reservoir Weather Forecast

    • 37
    • 65

    Sunny

    • 45
    • 76

    Mostly Sunny

    • 50
    • 82

    Mostly Sunny

    • 50
    • 81

    Partly Sunny

    • 46
    • 75

    Mostly Sunny

    • 41
    • 65

    Mostly Sunny

    • 43
    • 63

    Mostly Sunny

Today 7 Sep Modoc County

Sunny. Highs in the mid 60s to lower 70s. Southeast Winds around 5 Mph shifting to the west late this afternoon.

Tonight 7 Sep Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. North Winds around 5 Mph shifting to the northeast 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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