July in Philly has become 4.4 degrees hotter since 1940 on average. Nights are even warmer.
Average nighttime July temperatures for Philadelphia show a rise of 4.8 degrees between 1940 and 1925.
July 2, 2026
Philadelphians sweated through Julys in the 1940s, brooding over World War II as temperatures averaged in the mid-to-upper 70s, including nighttime lows.