Day A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 100. Light southwest wind. Chance of precipitation is 40%.
Night Partly cloudy, with a low around 68. Calm 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