Waterloo Weather Forecast

    • 79
    • 97

    Slight Chance Thunderstorms

    • 77
    • 93

    Chance Thunderstorms

    • 76
    • 91

    Chance Thunderstorms

    • 77
    • 95

    Mostly Sunny

    • 76
    • 96

    Partly Sunny

    • 75
    • 94

    Slight Chance Thunderstorms

Today 18 Jun Williamson

Mostly sunny. Highs in the upper 90s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Highest heat index Readings up to 115.

Tonight 18 Jun Williamson

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy after midnight. Humid with Lows in the upper 70s. Southeast Winds 10 to 15 Mph. Chance of rain 20 percent. Highest heat index Readings up to 113 early in the evening.

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Waterloo Temperature Statistics

June Temperature

Georgetown, Georgetown Municipal Airport (17.4 miles)

  • Lowest 3 June, 2026

    68 °F

  • Average June

    81.8 °F

  • Highest 2 June, 2026

    93.9 °F

Climate (2021–2026)

Georgetown, Georgetown Municipal Airport (17.4 miles)

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  • Average Low 2021–2026

    59.5 °F

  • Average 2021–2026

    69.8 °F

  • Average High 2021–2026

    80.7 °F
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