| NWS Forecast for: St. Clair County Issued by: National Weather Service Saint Louis, MO Last Update: 538 AM CDT Sun Sep 20 2026 | |
| Today: Partly sunny. Highs in the lower 90s. West winds 5 to 10 mph. Tonight: Showers likely with a chance of thunderstorms. Lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 70 percent. Monday: Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the morning. Cooler with highs in the upper 70s. North winds 5 to 10 mph. Chance of rain 40 percent. Monday Night: Mostly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. Tuesday: Mostly cloudy. Highs in the lower 70s. North winds 10 to 15 mph. Tuesday Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s. Wednesday Through Thursday Night: Partly cloudy. Highs in the mid 70s. Lows in the mid 50s. Friday: Partly sunny. Highs in the upper 70s. Friday Night And Saturday: Partly cloudy. Lows in the mid 50s. Highs in the upper 70s. | |
| Zone Forecast: St. Clair County | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |