Decorah Weather Forecast

    • 46
    • 67

    Chance Rain Showers

    • 62
    • 67

    Rain Showers

    • 53
    • 72

    Chance Rain Showers

    • 57
    • 67

    Rain Showers Likely

    • 53
    • 71

    Chance Rain Showers

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    • 72

    Chance Rain Showers

Today 13 Sep Winneshiek

Partly sunny with a 40 percent chance of Showers. Highs in the mid 60s. Northwest Winds around 5 Mph.

Tonight 13 Sep Winneshiek

Mostly clear. Lows in the mid 40s. West Winds around 5 Mph, becoming south after midnight.

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Decorah Temperature Statistics

September Temperature

Decorah (2.5 miles)

  • Lowest 10 September, 2026

    55.4 °F

  • Average September

    72.6 °F

  • Highest 4 September, 2026

    87.8 °F

Climate (2021–2026)

Decorah (2.5 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    47.8 °F

  • Average High 2021–2026

    56.5 °F
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