A buoy in Manatee Bay, about 40 miles south of Miami, posted a temperature of 101.1 degrees at 6 p.m. after a morning low of 91 degrees. Temperatures remained at or above 100 from 5 p.m. through late evening. For comparison, the “ideal” temperature of a hot tub is 100 to 102 degrees, according to jacuzzi.com.