Philadelphia, Pennsylvania – A widespread cooldown is expected to settle across Pennsylvania from July 23 through July 27, bringing temperatures below seasonal averages statewide while rainfall is projected to remain close to normal. The late-July pattern favors several days of milder afternoons, lower humidity and periodic opportunities for showers, offering a break from the more typical midsummer heat.
According to the National Oceanic and Atmospheric Administration’s Climate Prediction Center, in its 6-10 Day Outlook issued July 17, Pennsylvania is favored to experience below-normal temperatures during the July 23-27 period. The state is also included in a near-normal precipitation zone, indicating there is no strong climate signal favoring either significantly wetter or drier-than-average conditions.
In Philadelphia, cooler air filtering south from Canada is expected to keep afternoon temperatures several degrees below what is normally experienced during the final week of July. Humidity levels should also ease, making conditions more comfortable for commuters, outdoor events and recreation. While passing disturbances could produce scattered showers during the five-day period, rainfall is expected to remain close to seasonal averages without a heightened threat of widespread flooding.
Across western Pennsylvania, Pittsburgh is expected to experience a similar cooling trend. Daytime highs are forecast to remain below average, while cooler overnight temperatures provide relief from recent summer warmth. Intervals of clouds and occasional showers are possible as weak weather systems move across the region, but current climate guidance does not indicate an extended period of heavy rainfall. Instead, precipitation should remain generally consistent with late-July normals.
The cooler weather is expected to extend across the Commonwealth, including Harrisburg, Allentown, Erie, Reading, Scranton and State College. Higher elevations of the Allegheny Plateau and Pocono Mountains could experience the largest departures below average, particularly during the overnight and early morning hours when the cooler air mass settles across the region. Even southeastern Pennsylvania is expected to remain comfortably below normal through much of the outlook period.
While the Climate Prediction Center outlook does not specify the exact timing of individual weather systems, confidence continues to increase that Pennsylvania will remain in a cooler-than-average pattern through July 27. Additional updates from the National Weather Service will provide more precise information on daily temperatures and shower timing, but current guidance points toward an extended stretch of comfortable midsummer weather rather than a return to prolonged heat.
