Waterloo Weather Forecast

    • 55
    • 77

    Becoming Sunny

    • 65
    • 81

    Chance Rain Showers

    • 61
    • 81

    Slight Chance Thunderstorms

    • 58
    • 81

    Mostly Sunny

    • 60
    • 81

    Slight Chance Rain Showers

    • 64
    • 81

    Chance Rain Showers

    • 68
    • 83

    Chance Rain Showers

Today 24 Aug Jefferson

Partly sunny. Northwest Winds up to 5 Mph.

Tonight 24 Aug Jefferson

Mostly clear. Lows in the mid 50s. East Winds up to 5 Mph shifting to the south after midnight.

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Waterloo Temperature Statistics

August Temperature

Watertown (13 miles)

  • Lowest 20 August, 2026

    52.2 °F

  • Average August

    70.4 °F

  • Highest 7 August, 2026

    83.8 °F

Climate (2021–2026)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    53.9 °F
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