South Mountain Reservoir Weather Forecast

    • 50
    • 83

    Sunny

    • 46
    • 82

    Mostly Sunny

    • 47
    • 78

    Mostly Sunny

    • 35
    • 64

    Slight Chance Rain

    • 39
    • 59

    Mostly Sunny

    • 41
    • 64

    Mostly Sunny

    • 42
    • 67

    Mostly Sunny

Today 9 Sep Modoc County

Sunny. Highs in the lower 80s to lower 90s. East Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 9 Sep Modoc County

Mostly clear. Lows in the lower to mid 50s. Northwest Winds 5 to 10 Mph shifting to the east well 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

    49.1 °F

  • Average High 2021–2026

    64.7 °F
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