Duncan Reservoir Weather Forecast

    • 49
    • 82

    Sunny

    • 50
    • 84

    Sunny

    • 54
    • 85

    Partly Sunny

    • 50
    • 76

    Mostly Cloudy

    • 49
    • 76

    Partly Sunny

    • 48
    • 75

    Mostly Sunny

Today 16 Sep Modoc County

Sunny. Highs in the mid 70s to mid 80s. East Winds 5 to 10 Mph shifting to the south in the afternoon.

Tonight 16 Sep Modoc County

Clear. Lows in the mid 40s to lower 50s. South Winds 5 to 10 Mph shifting to the southeast after midnight.

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Duncan Reservoir Temperature Statistics

September Temperature

Alturas (19.9 miles)

  • Lowest 13 September, 2025

    41 °F

  • Average September

    66.5 °F

  • Highest 1 September, 2025

    91 °F

Climate (2020–Present)

Alturas (19.9 miles)

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  • Average Low 2020–2025

    32.9 °F

  • Average 2020–2025

    49.2 °F

  • Average High 2020–2025

    64.4 °F
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