South Mountain Reservoir Weather Forecast

    • 46
    • 81

    Becoming Sunny

    • 48
    • 78

    Mostly Sunny

    • 39
    • 71

    Slight Chance Rain

    • 38
    • 61

    Mostly Sunny

    • 41
    • 66

    Sunny

    • 45
    • 71

    Mostly Sunny

    • 47
    • 74

    Mostly Sunny

Today 10 Sep Modoc County

Mostly cloudy until early afternoon then becoming partly cloudy. Highs in the lower to mid 80s. South Winds 5 to 10 Mph shifting to the southwest 10 to 15 Mph this afternoon.

Tonight 10 Sep Modoc County

Partly cloudy early this evening then becoming mostly clear. Lows in the mid 40s to lower 50s. West Winds 15 to 20 Mph decreasing to 5 to 10 Mph with Gusts to around 30 Mph late this evening and overnight.

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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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