It does get hot in Newport from time to time, but on most of those days, if you can survive until noon-thirty, the big cooling machine kicks in.
The Vanderbilts and their ilk built their summer "cottages" on the perimeter of the island where they were certain to be in the draught and used lots of marble to act as a "cold sink" to keep the houses cool through the night.
You Mainers have the same system.
My in-laws are almost on the Chesapeake Bay and in summer are several degrees cooler than we inlanders . . but the Chesapeake is not 65 degrees at this time of year . . .