| NWS Forecast for: St. Clair County Issued by: National Weather Service Saint Louis, MO Last Update: 938 PM CDT Tue Aug 25 2026 |  |
| Tonight: Mostly cloudy. Lows in the upper 60s. Southeast winds around 5 mph. Wednesday: Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Wednesday Night: Mostly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the mid 60s. Northwest winds around 5 mph. Chance of rain 40 percent. Thursday: Sunny. Highs in the mid 80s. North winds 5 to 10 mph. Thursday Night: Mostly clear. Lows in the mid 60s. North winds around 5 mph. Friday: Sunny. Highs in the mid 80s. Friday Night And Saturday: Mostly clear. Lows in the lower 60s. Highs in the upper 80s. Saturday Night: Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 60s. Sunday: Mostly sunny. Highs in the lower 90s. Sunday Night: Mostly clear. Lows in the lower 70s. Monday: Mostly sunny. Highs in the mid 90s. Heat index values up to 100 in the afternoon. Monday Night And Tuesday: Partly cloudy. A 20 percent chance of showers. Lows in the mid 70s. Highs in the lower 90s. Heat index values up to 100. | |
| Zone Forecast: St. Clair County | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |