Sumner Weather Forecast

    • 59
    • 78

    Increasing Clouds

    • 61
    • 79

    Mostly Sunny

    • 60
    • 79

    Rain Showers Likely

    • 57
    • 74

    Chance Rain Showers

    • 62
    • 77

    Slight Chance Rain Showers

    • 66
    • 81

    Slight Chance Thunderstorms

Today 2 Aug Bremer

Mostly sunny. Humid with Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 2 Aug Bremer

Mostly clear. Lows in the upper 50s. East Winds around 5 Mph.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

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  • Average August

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Climate (2021–2026)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    58 °F
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