Sumner Weather Forecast

    • 45
    • 59

    Decreasing Clouds

    • 50
    • 66

    Partly Sunny

    • 52
    • 66

    Mostly Cloudy

    • 51
    • 68

    Mostly Cloudy

    • 53
    • 64

    Chance Rain Showers

    • 56
    • 70

    Mostly Cloudy

Today 22 Sep Bremer

Mostly cloudy with a 50 percent chance of Showers. Highs around 70.

Tonight 22 Sep Bremer

Mostly cloudy Early, then becoming partly cloudy. Lows in the mid 40s. East Winds 5 to 10 Mph.

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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

    68.7 °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

    57.9 °F
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