Hottest and Coldest Temperatures Ever in Philadelphia on July 20

On July 20th in Philadelphia, temperatures can range from a scorching high of 97.0°F, recorded in 1991, to a chilly low of 59.0°F, experienced in 1965. The average temperature for this date hovers around 78.01°F. Generally, one can expect a warm day with an average high of 81.79°F and a mild night with an average low of 74.23°F. In 1991, while Philadelphia was enduring the hot summer, an interesting news item was the opening of the first-ever Starbucks in the city, serving their signature coffees to enthusiastic Philadelphians.