Boston is facing the third heat wave of the summer this week and for many towns in Massachusetts, it will be heat wave number four.

So far, 16 days have been at or above 90 degrees at Logan Airport in Boston, all of them in June and July. August actually started on a different note. The first week of the month was the coolest start to August since 1976. Now, temperatures are about to flip fast.

The latest stretch kicks off inland Sunday. Worcester County, the Merrimack Valley, and southern New Hampshire will climb into the low 90s with sunshine and almost no clouds to offer relief. Boston stays a bit cooler thanks to a sea breeze, but that's temporary.

Boston will hit the low 90s Monday, then the mid-90s on Tuesday. Wednesday could be the hottest day yet, flirting with the mid-to-up

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