Harpers Ferry Weather Forecast

    • 51
    • 69

    Partly Sunny

    • 55
    • 69

    Mostly Cloudy

    • 52
    • 69

    Mostly Cloudy

    • 53
    • 66

    Chance Rain Showers

    • 53
    • 67

    Mostly Cloudy

    • 56
    • 72

    Mostly Cloudy

Today 23 Sep Allamakee

Mostly cloudy in the Morning, then becoming partly sunny. A 50 percent chance of Showers. Highs in the mid 60s.

Tonight 23 Sep Allamakee

Partly cloudy. Lows in the lower 50s. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Harpers Ferry Temperature Statistics

September Temperature

Prairie Du Chien Municipal Airport (12.4 miles)

  • Lowest 14 September, 2026

    47.3 °F

  • Average September

    68.5 °F

  • Highest 4 September, 2026

    90.7 °F

Climate (2021–2026)

Prairie Du Chien Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    40.5 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    59.5 °F
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