Sumner Weather Forecast

    • 76
    • 91

    Slight Chance Thunderstorms

    • 74
    • 91

    Chance Thunderstorms

    • 75
    • 90

    Chance Thunderstorms

    • 72
    • 89

    Rain Showers Likely

    • 70
    • 87

    Chance Thunderstorms

    • 69
    • 86

    Chance Thunderstorms

    • 65
    • 83

    Slight Chance Thunderstorms

Today 29 Jun Bremer

Sunny, breezy. Near steady temperature around 90. South Winds around 25 Mph with Gusts up to 35 Mph. Heat index Values up to 108.

Tonight 29 Jun Bremer

Mostly clear this Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Breezy with Lows in the mid 70s. South Winds 20 to 25 Mph with Gusts up to 35 Mph, Diminishing to 10 to 15 Mph with Gusts up to 25 Mph after midnight. Chance of rain 20 percent. Heat index Values up to 108 early this evening.

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Sumner Temperature Statistics

June Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 15 June, 2026

    48.2 °F

  • Average June

    67.7 °F

  • Highest 4 June, 2026

    86 °F

Climate (2021–2026)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    48.5 °F

  • Average High 2021–2026

    58.3 °F
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