South Mountain Reservoir Weather Forecast

    • 34
    • 59

    Chance Rain Showers

    • 37
    • 65

    Mostly Sunny

    • 48
    • 73

    Mostly Sunny

    • 51
    • 79

    Partly Sunny

    • 50
    • 80

    Mostly Sunny

    • 47
    • 75

    Mostly Sunny

Today 6 Sep Modoc County

Mostly cloudy. Slight chance of Thunderstorms late this Morning, then chance of Showers and slight chance of Thunderstorms this afternoon. Highs in the mid 50s to mid 60s. Southwest Winds 10 to 15 Mph shifting to the west late this afternoon. Chance of precipitation 30 percent.

Tonight 6 Sep Modoc County

Mostly clear. Areas of frost after midnight. Lows in the mid 30s. Northwest Winds 5 to 10 Mph until well after midnight becoming light.

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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

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.7 °F
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