| NWS Forecast for: St. Clair County Issued by: National Weather Service Saint Louis, MO Last Update: 453 AM CDT Sat Sep 19 2026 | |
Today: Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Tonight: Partly cloudy. Lows in the lower 70s. Southwest winds around 5 mph. Sunday: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 90s. West winds around 5 mph. Chance of rain 50 percent. Sunday Night: Mostly cloudy. A chance of showers and thunderstorms in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 70 percent. Monday: Showers likely with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Cooler with highs in the upper 70s. Northeast winds 10 to 15 mph. Chance of rain 70 percent. Monday Night: A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the upper 50s. Chance of rain 20 percent. Tuesday And Tuesday Night: Mostly cloudy. Highs in the lower 70s. Lows in the mid 50s. Wednesday Through Thursday: Partly cloudy. Highs in the mid 70s. Lows in the mid 50s. Thursday Night And Friday: Mostly cloudy. Lows in the upper 50s. Highs in the upper 70s. | |
| Zone Forecast: St. Clair County | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |