Sumner Weather Forecast

    • 60
    • 87

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 56
    • 83

    Mostly Sunny

    • 55
    • 80

    Partly Sunny

    • 55
    • 81

    Mostly Sunny

Today 27 May Bremer

Mostly Cloudy, then becoming mostly sunny this Morning, then becoming sunny. A slight chance of Showers early. Highs in the upper 80s. Northeast Winds around 5 Mph, becoming southeast around 5 Mph. Chance of rain 20 percent.

Tonight 27 May Bremer

Mostly clear. Lows around 60. East Winds around 5 Mph, increasing to 10 to 15 Mph after midnight.

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Sumner Temperature Statistics

May Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 6 May, 2026

    30.2 °F

  • Average May

    57.4 °F

  • Highest 15 May, 2026

    84.2 °F

Climate (2021–Present)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    48.4 °F

  • Average High 2021–2026

    58.2 °F
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