Sumner Weather Forecast

    • 69
    • 79

    Rain Showers

    • 71
    • 86

    Chance Thunderstorms

    • 71
    • 88

    Chance Thunderstorms

    • 70
    • 87

    Chance Thunderstorms

    • 70
    • 87

    Slight Chance Thunderstorms

    • 69
    • 87

    Chance Rain Showers

Today 29 Aug Bremer

Mostly cloudy in the Morning, then becoming partly sunny. A slight chance of Thunderstorms. Showers Likely, mainly in the morning. Highs in the lower 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 29 Aug Bremer

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 23 August, 2026

    50 °F

  • Average August

    70.6 °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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