Sumner Weather Forecast

    • 61
    • 70

    Chance Rain Showers

    • 61
    • 74

    Rain Showers

    • 63
    • 73

    Rain Showers

    • 58
    • 74

    Chance Rain Showers

    • 55
    • 67

    Chance Rain Showers

    • 53
    • 66

    Chance Rain Showers

Today 16 Sep Bremer

Mostly cloudy this Morning, then becoming partly sunny. Highs around 70. East Winds 5 to 10 Mph.

Tonight 16 Sep Bremer

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. Southeast Winds 5 to 10 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

    70.3 °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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