Harper Weather Forecast

    • 64
    • 88

    Thunderstorms

    • 62
    • 86

    Chance Rain Showers

    • 60
    • 81

    Chance Thunderstorms

    • 62
    • 83

    Chance Thunderstorms

    • 62
    • 82

    Chance Rain Showers

    • 59
    • 82

    Chance Thunderstorms

Today 17 Sep Keokuk

Sunny. Highs in the upper 80s. Southeast Winds around 5 Mph.

Tonight 17 Sep Keokuk

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the lower 60s. East Winds around 5 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Harper Temperature Statistics

September Temperature

Washington (20.5 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    66.1 °F

  • Highest 13 September, 2025

    96.8 °F

Climate (2020–Present)

Washington (20.5 miles)

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

  • Average Low 2020–2025

    41.6 °F

  • Average 2020–2025

    51.8 °F

  • Average High 2020–2025

    62.2 °F
Get WillyWeather+ to remove ads