Ossian Weather Forecast

    • 50
    • 69

    Partly Cloudy

    • 55
    • 70

    Chance Thunderstorms

    • 49
    • 73

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 51
    • 68

    Mostly Cloudy

    • 53
    • 70

    Partly Sunny

Today 26 Aug Winneshiek

Partly cloudy. A chance of Sprinkles this afternoon. Highs around 70. Northwest Winds around 5 Mph.

Tonight 26 Aug Winneshiek

Partly cloudy in the Evening, then becoming mostly clear. Lows around 50. Light Winds.

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Ossian Temperature Statistics

August Temperature

Decorah (9.3 miles)

  • Lowest 1 August, 2025

    50 °F

  • Average August

    70.7 °F

  • Highest 8 August, 2025

    87.8 °F

Climate (2020–Present)

Decorah (9.3 miles)

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  • Average Low 2020–2025

    39.3 °F

  • Average 2020–2025

    47.9 °F

  • Average High 2020–2025

    56.4 °F
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