Sumner Weather Forecast

    • 58
    • 72

    Rain Showers Likely

    • 51
    • 66

    Chance Rain Showers

    • 46
    • 59

    Chance Rain Showers

    • 43
    • 60

    Mostly Sunny

    • 48
    • 64

    Partly Sunny

    • 51
    • 66

    Partly Sunny

Today 19 Sep Bremer

Showers likely with a chance of Thunderstorms. Near steady temperature in the lower 70s. Southeast Winds around 5 Mph. Chance of rain 70 percent.

Tonight 19 Sep Bremer

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of Showers. Lows in the upper 50s. North Winds 10 to 15 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

September Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 13 September, 2026

    50 °F

  • Average September

    69.4 °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

    38.5 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    57.9 °F
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