Merrimac Weather Forecast

    • 57
    • 80

    Slight Chance Thunderstorms

    • 56
    • 83

    Thunderstorms Likely

    • 37
    • 70

    Slight Chance Rain Showers

    • 34
    • 53

    Mostly Sunny

    • 53
    • 71

    Mostly Sunny

    • 55
    • 76

    Mostly Cloudy

Today 13 Mar Monroe

Mostly sunny. Highs around 80. Southeast Winds around 5 Mph.

Tonight 13 Mar Monroe

Partly cloudy and not as cool. Near steady temperature in the mid 50s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Merrimac Temperature Statistics

March Temperature

St. Louis Downtown Airport (16.2 miles)

  • Lowest 2 March, 2025

    21.8 °F

  • Average March

    43.4 °F

  • Highest 3 March, 2025

    64.7 °F

Climate (2020–Present)

St. Louis Downtown Airport (16.2 miles)

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  • Average Low 2020–2025

    47.2 °F

  • Average 2020–2025

    57.5 °F

  • Average High 2020–2025

    68.1 °F
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