St Peters Weather Forecast

    • 70
    • 79

    Rain Showers

    • 56
    • 84

    Rain Showers

    • 51
    • 69

    Mostly Cloudy

    • 57
    • 74

    Chance Thunderstorms

    • 59
    • 76

    Chance Thunderstorms

    • 61
    • 82

    Slight Chance Thunderstorms

Today 18 May St. Charles

Showers. A chance of Thunderstorms this Morning, then Thunderstorms likely this afternoon. Near steady temperature in the upper 70s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

Tonight 18 May St. Charles

Mostly cloudy with a chance of Showers. A chance of Thunderstorms, mainly in the evening. Lows around 70. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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  • Temperature Real-Time

St Peters Temperature Statistics

May Temperature

St. Louis, Spirit Of St. Louis Airport (8.7 miles)

  • Lowest 7 May, 2026

    36.6 °F

  • Average May

    60.5 °F

  • Highest 15 May, 2026

    83.6 °F

Climate (2021–Present)

St. Louis, Spirit Of St. Louis Airport (8.7 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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