Sumner Weather Forecast

    • 55
    • 74

    Mostly Sunny

    • 61
    • 76

    Partly Sunny

    • 63
    • 79

    Slight Chance Thunderstorms

    • 61
    • 81

    Mostly Sunny

    • 60
    • 79

    Mostly Sunny

    • 63
    • 79

    Partly Sunny

Today 23 Aug Bremer

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 23 Aug Bremer

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. Northeast Winds around 5 Mph, becoming southeast after midnight.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 20 August, 2026

    57.2 °F

  • Average August

    72.3 °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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