Old Monroe Weather Forecast

    • 70
    • 93

    Slight Chance Thunderstorms

    • 65
    • 86

    Partly Sunny

    • 63
    • 83

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

Today 19 Aug Lincoln

Mostly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 90s. North Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 106.

Tonight 19 Aug Lincoln

Partly cloudy. Lows in the upper 60s. North Winds around 5 Mph.

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Old Monroe Temperature Statistics

August Temperature

St. Charles, St. Charles County Smartt Airport (16.8 miles)

  • Lowest 3 August, 2025

    58.6 °F

  • Average August

    78.7 °F

  • Highest 15 August, 2025

    96.7 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (16.8 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.4 °F
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