Ossian Weather Forecast

    • 62
    • 79

    Chance Thunderstorms

    • 58
    • 75

    Chance Thunderstorms

    • 59
    • 76

    Chance Rain Showers

    • 61
    • 78

    Chance Thunderstorms

    • 56
    • 77

    Chance Rain Showers

    • 53
    • 73

    Slight Chance Thunderstorms

Today 18 Sep Winneshiek

Partly sunny. A chance of Showers in the Morning, then a slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs around 80. Southeast Winds around 5 Mph. Chance of rain 30 percent.

Tonight 18 Sep Winneshiek

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of Showers. Humid with Lows in the lower 60s. Southeast Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ossian Temperature Statistics

September Temperature

Decorah (9.3 miles)

  • Lowest 4 September, 2025

    41 °F

  • Average September

    62.5 °F

  • Highest 14 September, 2025

    86 °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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