CHICAGO (WLS) -- The Chicago area will be undergoing another day of extreme heat Monday. A National Weather Service Extreme Hear Warning will remain in effect for Cook County through Monday, expiring at midnight. An Extreme Heat Warning is also in effect for Kenosha, which is set to expire at 7 p.m.

The heat index reached 106 Saturday and an extreme heat warning is in effect until Monday, according to the National Weather Service. Residents are urged to stay indoors in air conditioned spaces. The city has opened multiple cooling centers.