Duncannon Weather Forecast

    • 62
    • 80

    Gradual Clearing

    • 61
    • 83

    Mostly Sunny

    • 60
    • 82

    Mostly Sunny

    • 62
    • 85

    Mostly Sunny

    • 65
    • 87

    Mostly Sunny

    • 68
    • 89

    Slight Chance Thunderstorms

Today 6 Aug Perry

Mostly cloudy. Highs around 80. East Winds around 5 Mph.

Tonight 6 Aug Perry

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 60s. East Winds around 5 Mph.

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Duncannon Temperature Statistics

August Temperature

Harrisburg, Capital City Airport (14.9 miles)

  • Lowest 3 August, 2025

    55 °F

  • Average August

    69.7 °F

  • Highest 4 August, 2025

    84.9 °F

Climate (2020–Present)

Harrisburg, Capital City Airport (14.9 miles)

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  • Average Low 2020–2025

    48.1 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    66.8 °F
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