Lake St Louis Weather Forecast

    • 73
    • 91

    Becoming Sunny

    • 70
    • 88

    Rain Showers Likely

    • 56
    • 85

    Rain Showers

    • 51
    • 70

    Mostly Cloudy

    • 54
    • 73

    Mostly Cloudy

    • 58
    • 77

    Chance Rain Showers

Today 17 May St. Charles

Partly sunny. Warmer with Highs in the upper 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 17 May St. Charles

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 70s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake St Louis Temperature Statistics

May Temperature

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Lowest 7 May, 2026

    36.6 °F

  • Average May

    59.6 °F

  • Highest 15 May, 2026

    82.9 °F

Climate (2021–Present)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    68.9 °F
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