Sumner Weather Forecast

    • 59
    • 79

    Becoming Sunny

    • 54
    • 79

    Mostly Sunny

    • 61
    • 80

    Partly Sunny

    • 66
    • 80

    Chance Thunderstorms

    • 66
    • 85

    Chance Thunderstorms

    • 64
    • 83

    Slight Chance Thunderstorms

Today 26 Aug Bremer

Sunny. Highs in the lower 80s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 26 Aug Bremer

Partly cloudy. Lows in the lower 60s. West Winds 5 to 10 Mph.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 23 August, 2026

    50 °F

  • Average August

    71.2 °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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