Excessive Heat — Delaware, Pennsylvania

2025-07-25 · Delaware, Pennsylvania

Event narrative

The heat index at Philadelphia International Airport reached 109 degrees, while at Wilmington Airport it reached 110 degrees.

Wider weather episode

A Bermuda high pressure and approaching cold front combined to produce a surge of heat and humidity across the region.

Source: NOAA Storm Events Database, event_id 1278972. Narrative written by the NWS forecast office that issued the report.