Waterloo Weather Forecast

    • 70
    • 88

    Slight Chance Thunderstorms

    • 71
    • 90

    Slight Chance Thunderstorms

    • 70
    • 89

    Rain Showers Likely

    • 68
    • 85

    Rain Showers Likely

    • 67
    • 86

    Chance Thunderstorms

    • 64
    • 84

    Partly Sunny

    • 62
    • 82

    Slight Chance Thunderstorms

Today 31 Aug Jefferson

Partly sunny with chance of light Showers and slight chance of Thunderstorms. Heat index Readings around 95. Southwest Winds 5 to 15 Mph. Chance of precipitation 40 percent.

Tonight 31 Aug Jefferson

Partly cloudy until early morning then becoming mostly cloudy. A 20 percent chance of light Showers in the evening. Patchy fog early in the morning. Lows around 70. Southwest Winds up to 5 Mph.

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Waterloo Temperature Statistics

August Temperature

Watertown (13 miles)

  • Lowest 24 August, 2026

    47.8 °F

  • Average August

    69.4 °F

  • Highest 7 August, 2026

    83.8 °F

Climate (2021–2026)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.1 °F

  • Average 2021–2026

    44.8 °F

  • Average High 2021–2026

    53.8 °F
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