Hopewell Valley residents planning Fourth of July celebrations are being urged to take precautions as dangerous heat settles over the region through Saturday, with temperatures expected to climb into the upper 90s and low 100s and heat index values reaching as high as 110 degrees.
According to the National Weather Service, Thursday and Friday are expected to be the hottest days of the stretch, though dangerous heat is expected to continue through Independence Day before conditions begin to ease Sunday. Forecasters say overnight temperatures will only fall into the mid-70s to low 80s, offering little relief between days.
“This is not the kind of heat event we see every year,” the National Weather Service said in its latest briefing, warning that the combination of extreme temperatures, high humidity and several consecutive days of heat could make this the hottest period the region has experienced in more than a decade.
For the Trenton area, which includes Hopewell Valley, high temperatures are forecast to reach approximately 103 degrees Thursday, 104 degrees Friday and 101 degrees Saturday, with heat index values well above the actual air temperature.
A Rare Stretch of Extreme Heat
While temperatures in the upper 90s are not unusual during a New Jersey summer, days that reach or exceed 100 degrees remain relatively rare in the Trenton area.
According to National Weather Service climate records, Trenton has only a 17% chance of reaching 100 degrees in any given year. The city’s most recent 100-degree day occurred on July 18, 2012, and its all-time record high is 106 degrees, reached on July 9, 1936, and again on July 22, 2011.
Forecast highs for Thursday and Friday are expected to approach or exceed the century mark, with heat index values climbing well above 110 degrees because of the added humidity. Even if the official air temperature falls just short of 100 degrees, forecasters say the combination of extreme heat, oppressive humidity and warm overnight temperatures will make this one of the most significant heat events the region has experienced in more than a decade.
The National Weather Service also notes that Trenton’s most recent stretch of consecutive 100-degree days occurred in July 2011, showing just how uncommon prolonged periods of extreme heat are in central New Jersey.
Extreme HeatRisk Through the Holiday
The National Weather Service has placed much of central New Jersey under its highest, Level 4 “Extreme HeatRisk,”for both Friday and Saturday.
That designation means the dangerous conditions are expected to affect everyone—not just vulnerable populations—and officials recommend limiting outdoor activities, staying in air conditioning whenever possible, drinking plenty of water and checking on neighbors, older adults and anyone without reliable cooling. Fans and open windows alone may not be enough during the overnight hours because temperatures are expected to remain unusually warm.
The weather service also notes that while isolated afternoon or evening thunderstorms are possible, any relief they provide will likely be brief and localized. Some storms could become severe, producing damaging wind gusts.
Cooling Centers Available in Hopewell
To help residents stay safe, the Hopewell Valley Office of Emergency Management will open a temporary cooling center from Thursday, July 2, through Saturday, July 4, from 9 a.m. to 4 p.m.
The cooling center will be located at:
Hopewell Township Municipal Building
201 Washington Crossing-Pennington Road
Titusville
Officials say the center is open to anyone who needs relief from the heat, particularly residents without adequate air conditioning or those looking for a safe place during the hottest part of the day.
Residents are encouraged to stay hydrated, avoid strenuous outdoor activity during the afternoon hours and check on family members, neighbors and others who may be especially vulnerable to heat-related illness.
Libraries Also Offer Air-Conditioned Relief
The Hopewell Branch of the Mercer County Library System, located at 245 Pennington-Titusville Road, is also available as a cooling location during normal operating hours.
The library will be open:
- Monday through Thursday: 9:30 a.m. to 8:30 p.m.
- Friday and Saturday: Closed for the July 4 holiday.
Other cooling centers across the county are open over the next few days including in Princeton, Lawrence, and Ewing. A full listing is located in the image to the right.
Heat Safety Tips
Health officials recommend residents:
- Drink water frequently, even if you do not feel thirsty.
- Wear lightweight, light-colored clothing.
- Limit outdoor activities during the hottest part of the day.
- Never leave children or pets inside parked vehicles.
- Know the signs of heat exhaustion and heat stroke.
- Check on elderly neighbors, relatives and anyone without air conditioning.
Even healthy adults can experience heat-related illness during prolonged extreme temperatures, especially when overnight lows remain elevated and the body has little opportunity to recover.
