Sumner Weather Forecast

    • 67
    • 89

    Severe Tstms

    • 56
    • 77

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 58
    • 77

    Partly Sunny

    • 60
    • 77

    Mostly Sunny

    • 66
    • 83

    Mostly Sunny

    • 69
    • 90

    Mostly Sunny

Today 20 Jul Bremer

Showers and Thunderstorms likely. Some Thunderstorms may be severe. Highs around 90. Southwest Winds 15 to 20 Mph. Chance of rain 60 percent. Heat index Values up to 106.

Tonight 20 Jul Bremer

Partly cloudy. A chance of Showers and Thunderstorms late this evening. Some Thunderstorms may be severe with damaging Winds, large Hail, and Tornadoes. Lows in the upper 60s. Southwest Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph. Chance of rain 40 percent.

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Sumner Temperature Statistics

July Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 6 July, 2026

    64.4 °F

  • Average July

    74.7 °F

  • Highest 1 July, 2026

    87.8 °F

Climate (2021–2026)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.7 °F

  • Average 2021–2026

    48.4 °F

  • Average High 2021–2026

    58.2 °F
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