Affton Weather Forecast

    • 66
    • 85

    Rain Showers

    • 64
    • 86

    Chance Thunderstorms

    • 59
    • 82

    Mostly Sunny

    • 60
    • 82

    Mostly Sunny

    • 66
    • 86

    Partly Sunny

    • 69
    • 89

    Chance Rain Showers

Today 31 May St. Louis

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 80s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 31 May St. Louis

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly cloudy with Showers with Thunderstorms likely after midnight. Lows in the lower 60s. Southeast Winds around 5 Mph. Chance of rain 80 percent.

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Affton Temperature Statistics

May Temperature

St. Louis Downtown Airport (9.9 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    65.6 °F

  • Highest 17 May, 2026

    89.7 °F

Climate (2021–Present)

St. Louis Downtown Airport (9.9 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    69.3 °F
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