Sumner Weather Forecast

    • 63
    • 77

    Mostly Cloudy

    • 66
    • 82

    Rain Showers

    • 54
    • 78

    Partly Sunny

    • 56
    • 75

    Mostly Sunny

    • 60
    • 79

    Partly Sunny

    • 58
    • 78

    Chance Thunderstorms

Today 7 Sep Bremer

Mostly cloudy. Highs in the upper 70s. Southeast Winds 10 to 15 Mph.

Tonight 7 Sep Bremer

Partly cloudy in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Lows in the lower 60s. Southeast Winds around 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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Sumner Temperature Statistics

September Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 2 September, 2026

    68 °F

  • Average September

    77.5 °F

  • Highest 4 September, 2026

    89.6 °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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