Waterloo Weather Forecast

    • 43
    • 75

    Becoming Sunny

    • 54
    • 74

    Mostly Sunny

    • 58
    • 80

    Mostly Cloudy

    • 44
    • 71

    Chance Thunderstorms

    • 42
    • 64

    Mostly Cloudy

    • 43
    • 61

    Mostly Cloudy

Today 21 Apr Jefferson

Warmer. Partly sunny. Scattered Sprinkles late in the morning. Highs in the mid 70s. Southwest Winds 5 to 15 Mph.

Tonight 21 Apr Jefferson

Mostly clear. Lows in the lower 40s. West Winds up to 5 Mph shifting to the northeast after midnight.

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Waterloo Temperature Statistics

April Temperature

Watertown (13 miles)

  • Lowest 7 April, 2026

    19.6 °F

  • Average April

    47.3 °F

  • Highest 17 April, 2026

    77 °F

Climate (2021–Present)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    45.6 °F

  • Average High 2021–2026

    54.7 °F
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