Waterloo Weather Forecast

    • 19
    • 26

    Increasing Clouds

    • 30
    • 36

    Chance Snow

    • 23
    • 40

    Mostly Cloudy

    • 33
    • 41

    Chance Rain

    • 31
    • 44

    Mostly Cloudy

    • 27
    • 37

    Mostly Cloudy

Today 21 Dec Jefferson

Colder, sunny. Highs in the mid 20s. West Winds up to 10 Mph shifting to the southwest in the afternoon.

Tonight 21 Dec Jefferson

Partly cloudy through around Midnight, then cloudy with a 30 percent chance of light snow after midnight. Lows around 19. South Winds 5 to 10 Mph.

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Waterloo Temperature Statistics

December Temperature

Watertown (13 miles)

  • Lowest 14 December, 2025

    -7.2 °F

  • Average December

    18 °F

  • Highest 18 December, 2025

    43.2 °F

Climate (2020–Present)

Watertown (13 miles)

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  • Average Low 2020–2025

    35.6 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    54.5 °F
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