Ossian Weather Forecast

    • 63
    • 79

    Increasing Clouds

    • 60
    • 80

    Mostly Sunny

    • 55
    • 77

    Mostly Sunny

    • 56
    • 75

    Partly Sunny

    • 59
    • 75

    Slight Chance Thunderstorms

    • 62
    • 79

    Slight Chance Thunderstorms

Today 20 Aug Winneshiek

Mostly sunny. Highs in the upper 70s. South Winds 5 to 10 Mph.

Tonight 20 Aug Winneshiek

Mostly cloudy. A slight chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Real-Time

Ossian Temperature Statistics

August Temperature

Decorah (9.3 miles)

  • Lowest 17 August, 2026

    57.2 °F

  • Average August

    72.6 °F

  • Highest 12 August, 2026

    84.2 °F

Climate (2021–2026)

Decorah (9.3 miles)

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  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    56.3 °F
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