Waterloo Weather Forecast

    • 5
    • 18

    Decreasing Clouds

    • 2
    • 19

    Mostly Sunny

    • 19
    • 30

    Mostly Cloudy

    • 22
    • 37

    Mostly Cloudy

    • 27
    • 38

    Chance Rain

    • 21
    • 35

    Mostly Cloudy

Today 30 Jan Monroe

Mostly sunny. A chance of Flurries this afternoon. Highs around 20. North Winds 5 to 10 Mph. Wind chill Values as low as 4 below.

Tonight 30 Jan Monroe

Mostly cloudy. A chance of Flurries in the evening. Cold with Lows around 5 above. North Winds 10 to 15 Mph. Wind chill Values as low as 8 below after midnight.

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Waterloo Temperature Statistics

January Temperature

St. Louis Downtown Airport (15.5 miles)

  • Lowest 26 January, 2026

    0 °F

  • Average January

    31.8 °F

  • Highest 6 January, 2026

    69.7 °F

Climate (2021–Present)

St. Louis Downtown Airport (15.5 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.7 °F
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