I remember going to the beach 7/3/66 and the sand was infernally hot. I think it was Bradley Beach near asbury park.
On 8/2/75 (hot Saturday), I was living in the Piano Craft Guild apartments in the south end of Boston. No ac. Stewing in my own juices while trying to sleep. ACK hit 100 that day. The next day a major bd came through and late afternoon temperatures were in the low 60s.