EXCESSIVE HEAT WATCH ... What's the record dew point for Chicago? Get link Facebook Twitter Pinterest Email Other Apps ★ CARDINAL NEWS ★ July 19, 2011 arlingtoncardinal.com Excessive Heat Watch for Chicagoland Wednesday morning through Thursday night; Near record dew points ... record high dew point for Chicago is 83°F recorded on July 30, 1999 ... Get link Facebook Twitter Pinterest Email Other Apps