Extreme heat is returning to most of the region as the work week gets underway.
The National Weather Service has issued a heat advisory for all of Massachusetts except for the Berkshires, Cape Cod and the islands.
Heat index values are expected to between 95 and 100 degrees today through Wednesday in the region.
The temperature could reach 90 degrees each of the next three days in Boston, Springfield and Worcester, which would make it the third heat wave of the summer in the state.
(Photo: National Weather Service)