Waterloo Weather Forecast

    • 45
    • 63

    Increasing Clouds

    • 44
    • 73

    Partly Sunny

    • 49
    • 72

    Mostly Sunny

    • 56
    • 80

    Sunny

    • 40
    • 80

    Partly Sunny

    • 36
    • 55

    Mostly Cloudy

Today 18 Mar Monroe

Partly sunny in the Morning, then clearing. Not as cool with Highs in the mid 60s. South Winds 5 to 10 Mph, becoming west in the afternoon.

Tonight 18 Mar Monroe

Mostly cloudy. Not as cool with Lows in the mid 40s. South Winds around 5 Mph.

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Waterloo Temperature Statistics

March Temperature

St. Louis Downtown Airport (15.5 miles)

  • Lowest 12 March, 2026

    32 °F

  • Average March

    56.8 °F

  • Highest 10 March, 2026

    84 °F

Climate (2021–Present)

St. Louis Downtown Airport (15.5 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    69 °F
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