Waterloo Weather Forecast

    • 69
    • 86

    Chance Thunderstorms

    • 66
    • 83

    Thunderstorms Likely

    • 64
    • 81

    Chance Thunderstorms

    • 65
    • 83

    Mostly Sunny

    • 63
    • 84

    Slight Chance Thunderstorms

    • 62
    • 82

    Partly Sunny

Today 18 Aug Monroe

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

Tonight 18 Aug Monroe

Clear in the Evening, then partly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Temperature Statistics

August Temperature

St. Louis Downtown Airport (15.5 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    80.2 °F

  • Highest 11 August, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (15.5 miles)

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

  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
Get WillyWeather+ to remove ads