Waterloo Weather Forecast

    • 60
    • 74

    Increasing Clouds

    • 62
    • 69

    Rain Showers

    • 50
    • 69

    Rain Showers

    • 43
    • 64

    Slight Chance Rain Showers

    • 49
    • 66

    Mostly Cloudy

    • 41
    • 64

    Mostly Sunny

Today 29 Sep Jefferson

Sunny in the morning then becoming partly sunny. Highs in the mid 70s. South Winds up to 10 Mph.

Tonight 29 Sep Jefferson

Warmer, cloudy. Chance of light Showers late in the evening. Light Showers likely after midnight. Lows around 60. South Winds 5 to 10 Mph. Chance of Showers 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Temperature Statistics

September Temperature

Watertown (13 miles)

  • Lowest 14 September, 2026

    40.8 °F

  • Average September

    64.6 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Watertown (13 miles)

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

  • Average Low 2021–2026

    35.3 °F

  • Average 2021–2026

    44.8 °F

  • Average High 2021–2026

    53.8 °F
Get WillyWeather+ to remove ads