Duncan Weather Forecast

    • 68
    • 93

    Slight Chance Thunderstorms

    • 66
    • 91

    Chance Thunderstorms

    • 68
    • 90

    Chance Thunderstorms

    • 67
    • 91

    Chance Thunderstorms

    • 67
    • 91

    Chance Thunderstorms

    • 63
    • 84

    Chance Rain Showers

Today 17 Sep Stephens

Sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 17 Sep Stephens

Mostly clear. Lows in the upper 60s. Southeast Winds around 5 Mph.

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Duncan Temperature Statistics

September Temperature

Duncan, Halliburton Field Airport (1.9 miles)

  • Lowest 8 September, 2025

    57.2 °F

  • Average September

    75.6 °F

  • Highest 11 September, 2025

    95 °F

Climate (2020–Present)

Duncan, Halliburton Field Airport (1.9 miles)

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  • Average Low 2020–2025

    52 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    74.8 °F
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