Hottest and Coldest Temperatures Ever in Philadelphia on September 15

On September 15th, Philadelphia experienced a range of temperatures throughout history. In 1970, the city reached its highest recorded temperature of 91.0°F, while in 1975, the coldest temperature of 46.0°F was recorded. On average, September 15th sees a temperature of 68.53°F, with a high of 72.94°F and a low of 64.12°F. In the year 1975, an interesting news item to note is that the blockbuster movie "Jaws" was released, forever changing the world's perception of sharks and popularizing the concept of a summer blockbuster.