Waterloo Weather Forecast

    • 75
    • 97

    Slight Chance Thunderstorms

    • 75
    • 98

    Slight Chance Thunderstorms

    • 72
    • 97

    Hot

    • 72
    • 96

    Hot

    • 74
    • 96

    Hot

    • 74
    • 96

    Slight Chance Thunderstorms

    • 74
    • 95

    Slight Chance Thunderstorms

Today 22 Sep Williamson

Mostly cloudy. A slight chance of Showers in the Morning, then a chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40 percent.

Tonight 22 Sep Williamson

Partly cloudy. A slight chance of Showers and Thunderstorms this evening. Lows in the mid 70s. East Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 20 percent.

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Waterloo Temperature Statistics

September Temperature

Georgetown, Georgetown Municipal Airport (17.4 miles)

  • Lowest 18 September, 2026

    75 °F

  • Average September

    87.1 °F

  • Highest 2 September, 2026

    102 °F

Climate (2021–2026)

Georgetown, Georgetown Municipal Airport (17.4 miles)

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  • Average Low 2021–2026

    59.7 °F

  • Average 2021–2026

    70.1 °F

  • Average High 2021–2026

    81 °F
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