Day A chance of showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Southwest wind around 6 mph. Chance of precipitation is 50%.
Night Partly cloudy, with a low around 70. Light southeast wind.
Includes the Counties: Madison County Il,
Saint Clair County Il,
Monroe County Il,
Saint Charles County Mo,
Saint Louis County Mo,
Saint Louis City County Mo,
Jefferson County Mo,
Including The Cities Of Alton, Edwardsville, Belleville, Cahokia,
Saint Charles, And Saint Louis