SPRINGFIELD – Illinoisans are celebrating the Fourth of July while braving triple-digit temperatures.

The National Weather service issued excessive heat warnings for most of Illinois on Wednesday, including Cook County and Chicago. Heat advisories are in effect for portions of northeastern Illinois. High temperatures are forecasted at 100 in Chicago with heat indexes of 105 to 110.

But it's hotter in central and southern Illinois. The National Weather Service says it will be 102 degrees in Springfield, Taylorville and Effingham on Wednesday with triple-digit readings through Friday. Last Fourth of July it was 86 in Springfield.