St. Louis Weather Forecast

    • 78
    • 95

    Rain Showers

    • 79
    • 96

    Thunderstorms

    • 79
    • 99

    Hot

    • 79
    • 101

    Hot

    • 75
    • 99

    Chance Rain Showers

    • 71
    • 90

    Slight Chance Thunderstorms

Today 12 Aug St. Louis City

Sunny. Isolated Showers and Thunderstorms this afternoon. Highs in the mid 90s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 108.

Tonight 12 Aug St. Louis City

Partly cloudy in the Evening, then becoming mostly cloudy. Isolated Thunderstorms. Isolated Showers in the Evening, then scattered Showers after midnight. Humid with Lows in the mid 70s. Southeast Winds around 5 Mph. Chance of rain 30 percent. Heat index Values up to 108 early in the evening.

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St. Louis Temperature Statistics

August Temperature

St. Louis Downtown Airport (5 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    77.6 °F

  • Highest 9 August, 2026

    92.6 °F

Climate (2021–2026)

St. Louis Downtown Airport (5 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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