Ten days ago I did the 10:00 boat from PVD (M/V Aurelia). Having read about the thermocline, I was (miserably overdressed) in a 5mm wetsuit with hood.
The first dive on Juno ledge, according to my Teric, splashed at 92 and ended at 87.
The second dive on the WPB Corridor splashed at 88 and finished at 90.
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I have no idea what to wear this coming weekend (I'm diving on the weekend after the mini-season goat rope.)
I would expect that by next weekend the temps would be back to normal for this time of year. Unless they're not. Your guess is as good as mine. I just know that I don't like diving in 68 degree water without my drysuit or 7mm!!!