Monday’s heat advisory is set to expire at 8 p.m. The advisory cautioned heat index values of up to 109 degrees.

Extreme heat is expected to hit the Chicago area again this week, and some felt the sweltering, humid temperatures on Sunday afternoon. The Chicago Office of Emergency Management and Communications pushed out a heat advisory Sunday afternoon, which the office said will last until Monday evening.

The National Weather Service has issued a heat advisory for the entire Chicago area ahead of more hot and humid conditions.