Sumner Weather Forecast

    • 67
    • 76

    Rain Showers

    • 66
    • 82

    Chance Rain Showers

    • 61
    • 78

    Chance Rain Showers

    • 60
    • 77

    Partly Sunny

    • 63
    • 77

    Rain Showers Likely

    • 60
    • 76

    Slight Chance Thunderstorms

Today 14 Aug Bremer

A chance of Thunderstorms. Showers Likely, mainly in the morning. Some Thunderstorms may produce heavy rainfall. Humid with Highs in the upper 70s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 14 Aug Bremer

A chance of Showers and Thunderstorms in the Evening, then Showers with a chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Locally heavy rainfall possible after midnight. Humid with Lows in the upper 60s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 11 August, 2026

    75.2 °F

  • Average August

    80.5 °F

  • Highest 11 August, 2026

    84.2 °F

Climate (2021–2026)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    57.9 °F
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