Humid cities · Pennsylvania
How humid is Philadelphia in summer?
Philadelphia right now
44°FBroken cloud
- Today44°F / 42°FClouds
- Tomorrow48°F / 37°FClouds
- Monday48°F / 36°FClouds
Waiting for sun? Don't hold your breath.
Live from OpenWeatherMap. Alerts from the National Weather Service.
Across June, July and August, the dew point in Philadelphia averages about 63°F, which is sticky on the usual dew point scale.
July is the muggiest month, with the dew point averaging about 64.9°F. On NOAA’s hour by hour normals, about 562 hours, about 6% of the year, average a dew point of 65°F or more. That makes it the joint 46th most humid summer of the 124 US cities we track.
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The highest dew point in the forecast for the next 48 hours is about 34°F, which is dry.
Philadelphia’s summer dew point averages about 63°F, and July gets to about 64.9. Sticky, but in a city that respects sticky.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer humidity at a glance
| Dew point, June to August | 63°F |
|---|---|
| Muggiest month | July, 64.9°F |
| Hours a year at a 65°F dew point or more | 562 (6%) |
| How summer feels | sticky |
The dew point is the temperature the air would have to cool to for dew to form, so the higher it is, the more water the air holds. Forecasters usually call under 55°F comfortable, 55 to 65°F sticky and 65°F or more muggy; 70°F or more feels tropical.
Cities with about the same summer air
- Indianapolis, Indiana: about 63°F
- Lincoln, Nebraska: about 63°F
- Des Moines, Iowa: about 62.8°F
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00013739. Average dew points, not the stickiest days.