Sumner Weather Forecast

    • 48
    • 67

    Becoming Sunny

    • 63
    • 71

    Rain Showers

    • 53
    • 70

    Rain Showers Likely

    • 59
    • 66

    Rain Showers

    • 58
    • 72

    Chance Rain Showers

    • 54
    • 70

    Chance Rain Showers

Today 13 Sep Bremer

Partly sunny. A chance of Showers, mainly this morning. Highs in the upper 60s. North Winds around 5 Mph. Chance of rain 30 percent.

Tonight 13 Sep Bremer

Partly cloudy. Lows in the upper 40s. North Winds around 5 Mph, becoming east after midnight.

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Sumner Temperature Statistics

September Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 10 September, 2026

    53.6 °F

  • Average September

    72.8 °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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