Waterloo Weather Forecast

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    • 84

    Chance Thunderstorms

    • 63
    • 85

    Chance Thunderstorms

    • 60
    • 78

    Chance Thunderstorms

    • 62
    • 81

    Chance Thunderstorms

    • 62
    • 80

    Chance Rain Showers

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    • 80

    Chance Rain Showers

Today 17 Sep Black Hawk

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the mid 80s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 17 Sep Black Hawk

Partly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. Southeast Winds around 5 Mph. Chance of rain 40 percent.

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Waterloo Temperature Statistics

September Temperature

Waterloo, Waterloo Municipal Airport (5 miles)

  • Lowest 7 September, 2025

    39.9 °F

  • Average September

    65.1 °F

  • Highest 13 September, 2025

    93.9 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (5 miles)

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  • Average Low 2020–2025

    40.1 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    61.5 °F
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