Hottest and Coldest Temperatures Ever in Philadelphia on September 12

On September 12th in Philadelphia, the weather has historically seen varied extremes. The hottest temperature on record for this date occurred in 1952, reaching a scorching 91.9°F, while the coldest temperature happened in 1958, plunging to 46.9°F. On average, the temperature for September 12th sits at a pleasant 69.55°F, with a typical high of 73.92°F and a low of 65.18°F. Interestingly, in the very year of the highest recorded temperature, 1952, the first successful pacemaker implantation took place, a significant medical breakthrough that highlighted Philadelphia's medical advancements.