Merrimac Weather Forecast

    • 56
    • 81

    Isolated Thunderstorms

    • 56
    • 82

    Thunderstorms

    • 37
    • 71

    Chance Rain Showers

    • 36
    • 55

    Mostly Sunny

    • 52
    • 73

    Mostly Sunny

    • 54
    • 77

    Mostly Cloudy

    • 35
    • 70

    Chance Rain Showers

Today 13 Mar Monroe

Sunny with isolated Showers and Thunderstorms. Near steady temperature around 80. Southeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 13 Mar Monroe

Mostly clear with a slight chance of rain and Thunderstorms this Evening, then partly cloudy after midnight. Lows in the mid 50s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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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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