It can be as hot on LI or even hotter on W wind days in the summer because of downsloping and compressional heating (the area just north of where the onshore and offshore winds meet) near the sea breeze front. That’s why often the hottest spots anywhere on those days are near JFK and S Nassau away from the barrier islands, or even on the barrier islands when they don’t turn to S winds. I totally agree about the humidity “saving” us (heat indices are often well over 100 now, so even the lower temps come with Miami like humidity because the waters are so warm) and the next dry period here being much hotter than before. We see how horrible the heat was down south last summer, one day that will be us too.