Duncan Weather Forecast

    • 66
    • 93

    Mostly Sunny

    • 65
    • 90

    Partly Sunny

    • 66
    • 91

    Partly Sunny

    • 66
    • 92

    Partly Sunny

    • 67
    • 90

    Slight Chance Thunderstorms

    • 68
    • 92

    Partly Sunny

Today 21 Sep Stephens

Sunny. A slight chance of Showers this afternoon. Highs in the lower 90s. Northeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 21 Sep Stephens

Mostly clear. Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Duncan Temperature Statistics

September Temperature

Duncan, Halliburton Field Airport (1.9 miles)

  • Lowest 11 September, 2026

    69.8 °F

  • Average September

    87.5 °F

  • Highest 12 September, 2026

    105.8 °F

Climate (2021–2026)

Duncan, Halliburton Field Airport (1.9 miles)

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  • Average Low 2021–2026

    52.9 °F

  • Average 2021–2026

    64.2 °F

  • Average High 2021–2026

    76.3 °F
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