Sumner Weather Forecast

    • 64
    • 79

    Increasing Clouds

    • 61
    • 79

    Mostly Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 74

    Partly Sunny

    • 61
    • 75

    Slight Chance Thunderstorms

    • 63
    • 79

    Slight Chance Thunderstorms

Today 20 Aug Bremer

Sunny. Highs in the upper 70s. Southeast Winds around 5 Mph, becoming south in the afternoon.

Tonight 20 Aug Bremer

Clear. Near steady temperature in the upper 50s. Northeast Winds around 5 Mph.

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Sumner Temperature Statistics

August Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 17 August, 2026

    59 °F

  • Average August

    73 °F

  • Highest 11 August, 2026

    84.2 °F

Climate (2021–2026)

Oelwein Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    57.9 °F
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