Not much to say about this forecast other than “torch!”
The worst of the humidity, by far, will be Thursday and Thursday night. Thankfully on Friday the wind will turn offshore bringing in drier air from the northwest so by Friday afternoon the humidity will lower quite a bit. Our computer models are showing 850mb temperatures near 24C which is just about as warm as you’ll ever see in New England.
It’s possible if we have full sunshine on Friday temperatures could rise into the low 100s and challenge some records (even down to the shoreline). Ouch.