| NWS Forecast for: Ballwin MO Issued by: National Weather Service Saint Louis, MO Last Update: 9:06 pm CDT Aug 9, 2026 |  |
Tonight: Mostly clear, with a low around 77. South wind 5 to 8 mph. Monday: Mostly sunny and hot, with a high near 97. Heat index values as high as 109. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Monday Night: Partly cloudy, with a low around 79. Southwest wind around 7 mph. Tuesday: Mostly sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind around 7 mph. Tuesday Night: Partly cloudy, with a low around 78. Southwest wind 3 to 6 mph. Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95. Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 76. Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 60%. Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%. Friday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 86. Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Saturday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Sunday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. | |
| Ballwin MO 38.58°N 90.55°W (Elev. 584 ft) | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |
