Waterloo Weather Forecast

    • 26
    • 48

    Becoming Sunny

    • 41
    • 53

    Partly Sunny

    • 42
    • 73

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 57
    • 78

    Rain Showers Likely

    • 43
    • 67

    Rain Showers Likely

    • 41
    • 63

    Slight Chance Rain Showers

Today 19 Apr Jefferson

Partly sunny. Near steady temperature in the upper 40s. Northwest Winds 10 to 15 Mph.

Tonight 19 Apr Jefferson

Partly cloudy through around midnight then becoming clear. Widespread frost after midnight. Lows in the mid 20s. Northwest Winds up to 10 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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