Bluffton Weather Forecast

    • 66
    • 86

    Increasing Clouds

    • 65
    • 86

    Slight Chance Thunderstorms

    • 64
    • 83

    Slight Chance Thunderstorms

    • 63
    • 86

    Slight Chance Thunderstorms

    • 61
    • 81

    Chance Thunderstorms

    • 56
    • 77

    Chance Thunderstorms

Today 13 Sep Winneshiek

Mostly sunny. Highs in the mid 80s. South Winds around 5 Mph.

Tonight 13 Sep Winneshiek

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Humid with Lows in the mid 60s. Southeast Winds around 5 Mph.

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Bluffton Temperature Statistics

September Temperature

Decorah (11.8 miles)

  • Lowest 4 September, 2025

    41 °F

  • Average September

    58.9 °F

  • Highest 11 September, 2025

    77 °F

Climate (2020–Present)

Decorah (11.8 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    47.9 °F

  • Average High 2020–2025

    56.4 °F
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