Merrimac Weather Forecast

    • 63
    • 84

    Partly Sunny

    • 63
    • 82

    Partly Sunny

    • 65
    • 80

    Chance Thunderstorms

    • 72
    • 90

    Mostly Sunny

    • 76
    • 97

    Partly Sunny

    • 74
    • 98

    Partly Sunny

Today 22 Jul Monroe

Sunny. Highs in the lower 80s. North Winds around 5 Mph.

Tonight 22 Jul Monroe

Mostly cloudy in the Evening, then clearing. Lows in the lower 60s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Merrimac Temperature Statistics

July Temperature

St. Louis Downtown Airport (16.2 miles)

  • Lowest 13 July, 2026

    67.6 °F

  • Average July

    81.3 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (16.2 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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