SPRINGFIELD, Ill. (AP) -- Record-breaking high temperatures greeted Illinoisans this Fourth of July.

The National Weather Service says Rockford reached 102 degrees on Wednesday, breaking the city's previous record of 101 in 1911. Chicago's reading of 102 degrees at O'Hare International Airport matched its record temperature of 102 -- also set in 1911.

The 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. Chicago heat indexes were between 105 and 110.

The hot weather is expected to continue through Sunday in central and southern Illinois. The weather service says the hottest weather will be along Interstate 70 with highs "well above 100 degrees each day."