| NWS Forecast for: Ballwin MO Issued by: National Weather Service Saint Louis, MO Last Update: 8:51 pm CDT Aug 7, 2026 | |
| Tonight: Partly cloudy, with a low around 71. Calm wind becoming southwest around 5 mph. Saturday: Sunny, with a high near 90. Light and variable wind. Saturday Night: Partly cloudy, with a low around 73. South wind around 5 mph becoming calm after midnight. Sunday: Sunny, with a high near 94. Heat index values as high as 107. South wind 3 to 6 mph. Sunday Night: Mostly clear, with a low around 76. South wind around 7 mph. Monday: Sunny, with a high near 95. Monday Night: Mostly clear, with a low around 77. Tuesday: Mostly sunny, with a high near 94. Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 75. Wednesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Thursday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Friday: A 40 percent chance of showers. Partly sunny, with a high near 82. | |
| Ballwin MO 38.58°N 90.55°W (Elev. 584 ft) | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |