The worst of New Jersey’s dangerous heat wave arrives Thursday and Friday, with an Extreme Heat Warning now in effect for nearly the entire state through Saturday evening.

Forecasters say inland temperatures will soar to 100-105 degrees, while the heat index—a measure of how hot it feels when humidity is factored in—could exceed 110 degrees. Overnight temperatures will remain in the 70s, offering little relief.

The National Weather Service warns that even short periods outdoors can quickly lead to heat exhaustion or heat stroke. Residents are urged to stay hydrated, avoid strenuous outdoor activity, wear light clothing, check on elderly neighbors, and never leave children or pets in vehicles.

The Jersey Shore will be slightly cooler thanks to sea breezes, but coastal communities will still experience dangerous heat and humidity under a Heat Advisory.

The Fourth of July will remain extremely hot, with highs in the upper 90s to around 100 degrees. While most holiday events should go on as planned, isolated late-day thunderstorms could briefly interrupt barbecues, parades, and fireworks displays.

Relief is finally expected Sunday as temperatures begin to ease into the low 90s. A much more dramatic cooldown arrives early next week, when widespread clouds, heavy rain, and highs in the 70s are expected across much of the state. Forecasters say several inches of much-needed rainfall are possible.