New Jersey, Pennsylvania Heat Advisory | Effective 05/18/2026 11:10

Headline: 
Heat Advisory issued May 18 at 2:10PM EDT until May 19 at 8:00PM EDT by NWS Mount Holly NJ
Event: 
Heat Advisory
Urgency: 
Expected
Effective: 
May 18, 2026 - 11:10am
Expires: 
May 19, 2026 - 2:00am
Description: 
* WHAT...Heat index values up to 97 expected. * WHERE...In New Jersey, Morris, Somerset, Warren, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...Until 8 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Tuesday, with maximum heat indices of 95 to near 100 degrees during peak heating through Tuesday afternoon. Given the intensity of this early season stretch of heat and humidity, we are not acclimated to it yet and therefore impacts could be greater if precautions are not taken. Showers and some thunderstorms arrive Wednesday afternoon and evening which will break this early season heat.
Instruction: 
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Area Description: 
Warren; Morris; Hunterdon; Somerset; Berks; Lehigh; Northampton; Western Chester; Western Montgomery; Upper Bucks
Forcast Office: 
NWS Mount Holly NJ