In August, St. Louis typically sees daytime highs of 31.0°C and overnight lows around 18.9°C. Compared to the annual average high of 19.0°C, August runs +12.0°C.
August in St. Louis averages a daytime high of 31.0°C and an overnight low of 18.9°C.
August runs +12.0°C compared to St. Louis's annual average high of 19.0°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 31.0°C and cooler evenings around 18.9°C.