Sumner Weather Forecast

    • 49
    • 70

    Mostly Sunny

    • 46
    • 67

    Increasing Clouds

    • 45
    • 66

    Mostly Sunny

    • 46
    • 69

    Mostly Sunny

    • 53
    • 71

    Partly Sunny

    • 55
    • 74

    Partly Sunny

    • 54
    • 73

    Partly Sunny

Today 23 Aug Bremer

Mostly sunny. Near steady temperature in the upper 60s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 23 Aug Bremer

Partly cloudy this Evening, then becoming mostly clear. Lows in the upper 40s. Northwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 1 August, 2025

    53.6 °F

  • Average August

    71.6 °F

  • Highest 16 August, 2025

    89.6 °F

Climate (2020–Present)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    38.3 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    57.7 °F
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