Excessive Heat — Mercer, New Jersey

2025-06-23 to 2025-06-25 · Mercer, New Jersey

Event narrative

Three days of high heat and humidity brought extreme heat indices. The heat index peaked at 109 degrees on June 23rd, 105 degrees on June 24th and 106 degrees on June 25th, all measured at Trenton-Mercer Airport.

Wider weather episode

A strong ridge of surface and upper level high pressure parked itself over much of the eastern United States, resulting in widespread extreme heat and humidity.

Source: NOAA Storm Events Database, event_id 1268046. Narrative written by the NWS forecast office that issued the report.