Sumner Weather Forecast

    • 63
    • 78

    Chance Thunderstorms

    • 59
    • 78

    Rain Showers Likely

    • 56
    • 74

    Partly Sunny

    • 58
    • 75

    Mostly Sunny

    • 60
    • 76

    Chance Rain Showers

    • 59
    • 77

    Mostly Sunny

Today 17 Aug Bremer

Sunny. Highs in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 17 Aug Bremer

Mostly clear in the Evening, then partly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows in the mid 60s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 14 August, 2026

    64.4 °F

  • Average August

    74.5 °F

  • Highest 11 August, 2026

    84.2 °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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