Philadelphia weather in September
Long-run climate averages for Philadelphia, PA in September, plus what the forecast models say for the days ahead.
In September, Philadelphia averages 78°F by day and 61°F at night. The wettest month is usually April.
September in Philadelphia averages a daytime high of 78°F and an overnight low of 61°F, which reads as warm for this part of the world. Across the whole year Philadelphia sees roughly 46 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Philadelphia forecast with every model compared and how much they currently agree.
Philadelphia weather by month
what to expect in Philadelphia through the yearHere is Philadelphia's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Philadelphia by season.