Effigy Mounds National Monument Weather Forecast

    • 61
    • 72

    Increasing Clouds

    • 60
    • 71

    Rain Showers

    • 50
    • 68

    Rain Showers Likely

    • 44
    • 65

    Slight Chance Rain Showers

    • 48
    • 65

    Mostly Cloudy

    • 43
    • 64

    Mostly Sunny

Today 29 Sep Clayton

Partly sunny this Morning, then becoming cloudy. Highs in the lower 70s. South Winds 5 to 10 Mph.

Tonight 29 Sep Clayton

A slight chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Effigy Mounds National Monument Temperature Statistics

September Temperature

Prairie Du Chien Municipal Airport (5.6 miles)

  • Lowest 23 September, 2026

    45.9 °F

  • Average September

    66.4 °F

  • Highest 4 September, 2026

    90.7 °F

Climate (2021–2026)

Prairie Du Chien Municipal Airport (5.6 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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