Waterloo Weather Forecast

    • 29
    • 35

    Slight Chance Wintry Mix

    • 16
    • 37

    Slight Chance Freezing Drizzle

    • 19
    • 28

    Partly Sunny

    • 36
    • 41

    Chance Rain

    • 24
    • 43

    Chance Snow

    • 20
    • 33

    Chance Rain/Snow

    • 5
    • 25

    Mostly Cloudy

Today 6 Dec Johnson

Mostly cloudy. Near steady temperature in the mid 30s. Southwest Winds around 5 Mph.

Tonight 6 Dec Johnson

Partly cloudy through Midnight, then mostly cloudy with a slight chance of freezing rain and snow toward daybreak. Patchy fog. Cold. Near steady temperature in the lower 30s. Southeast Winds around 5 Mph. Chance of precipitation 20 percent.

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Waterloo Temperature Statistics

December Temperature

Indianapolis International Airport (11.8 miles)

  • Lowest 4 December, 2025

    17.1 °F

  • Average December

    24.6 °F

  • Highest 1 December, 2025

    30 °F

Climate (2020–Present)

Indianapolis International Airport (11.8 miles)

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  • Average Low 2020–2025

    46.6 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    64.8 °F
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