Sumner Weather Forecast

    • 57
    • 79

    Increasing Clouds

    • 60
    • 82

    Partly Sunny

    • 61
    • 85

    Partly Sunny

    • 60
    • 84

    Slight Chance Thunderstorms

    • 57
    • 82

    Slight Chance Thunderstorms

    • 54
    • 77

    Partly Sunny

Today 24 May Bremer

Mostly sunny. Highs around 80. Northwest Winds around 5 Mph, increasing to southwest 10 to 15 Mph.

Tonight 24 May Bremer

Mostly clear in the Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

May Temperature

Oelwein Municipal Airport (12.4 miles)

  • Lowest 6 May, 2026

    30.2 °F

  • Average May

    56.8 °F

  • Highest 15 May, 2026

    84.2 °F

Climate (2021–Present)

Oelwein Municipal Airport (12.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    48.4 °F

  • Average High 2021–2026

    58.2 °F
Get WillyWeather+ to remove ads