Sumner Weather Forecast

    • 61
    • 70

    Rain Showers

    • 60
    • 69

    Rain Showers

    • 47
    • 66

    Chance Rain Showers

    • 47
    • 63

    Mostly Sunny

    • 49
    • 64

    Partly Sunny

    • 43
    • 62

    Mostly Sunny

Today 29 Sep Bremer

Partly sunny in the Morning, then mostly cloudy with a chance of Showers in the afternoon. Highs in the lower 70s. South Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 29 Sep Bremer

A slight chance of Thunderstorms. Showers likely. Some Thunderstorms may produce heavy rainfall. Lows in the lower 60s. South Winds 10 to 15 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

September Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 23 September, 2026

    46.4 °F

  • Average September

    66.2 °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

    48.1 °F

  • Average High 2021–2026

    57.8 °F
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