Ossian Weather Forecast

    • 58
    • 71

    Chance Rain Showers

    • 62
    • 69

    Rain Showers

    • 57
    • 75

    Rain Showers Likely

    • 52
    • 64

    Chance Rain Showers

    • 49
    • 60

    Chance Rain Showers

    • 50
    • 62

    Mostly Cloudy

Today 17 Sep Winneshiek

Patchy fog late this morning. Mostly cloudy with a chance of Sprinkles. Highs in the lower 70s. Northeast Winds around 5 Mph.

Tonight 17 Sep Winneshiek

Mostly cloudy. Lows in the upper 50s. Northeast Winds around 5 Mph.

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Ossian Temperature Statistics

September Temperature

Decorah (9.3 miles)

  • Lowest 13 September, 2026

    48.2 °F

  • Average September

    69.7 °F

  • Highest 4 September, 2026

    87.8 °F

Climate (2021–2026)

Decorah (9.3 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    47.8 °F

  • Average High 2021–2026

    56.4 °F
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