South Mountain Reservoir Weather Forecast

    • 47
    • 77

    Mostly Sunny

    • 39
    • 75

    Chance Rain Showers

    • 37
    • 60

    Mostly Sunny

    • 41
    • 68

    Sunny

    • 44
    • 73

    Mostly Sunny

    • 45
    • 74

    Mostly Sunny

    • 46
    • 78

    Mostly Sunny

Today 11 Sep Modoc County

Sunny. Highs in the mid 70s to lower 80s. Southwest Winds around 5 Mph increasing to 10 to 20 Mph this afternoon.

Tonight 11 Sep Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. 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

    33.2 °F

  • Average 2021–2026

    49.1 °F

  • Average High 2021–2026

    64.7 °F
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