| NWS Forecast for: St. Charles County Smartt Airport MO Issued by: National Weather Service Saint Louis, MO Last Update: 9:06 am CDT Jul 21, 2026 |  |
Today: A 30 percent chance of showers and thunderstorms, mainly before 10am. Partly sunny, then gradually becoming sunny, with a high near 94. Heat index values as high as 100. Northwest wind 6 to 15 mph. Tonight: Mostly clear, with a low around 68. North wind 8 to 14 mph. Wednesday: Mostly sunny, with a high near 82. North wind 8 to 13 mph. Wednesday Night: Partly cloudy, with a low around 62. Northeast wind 5 to 10 mph. Thursday: Mostly sunny, with a high near 81. East wind 5 to 8 mph. Thursday Night: Partly cloudy, with a low around 62. Friday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%. Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Saturday: Mostly sunny, with a high near 88. Saturday Night: Mostly clear, with a low around 68. Sunday: Sunny, with a high near 94. Sunday Night: Partly cloudy, with a low around 72. Monday: Mostly sunny, with a high near 94. | |
| St. Charles County Smartt Airport MO 38.94°N 90.45°W (Elev. 427 ft) | |
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