An extreme heat warning has been put in place for the entire state of New Jersey, lasting through Saturday evening.

The alert, which began at 8:00 p.m. on July 4, covers the upcoming Fourth of July weekend and is expected to remain in effect until the night of Saturday. Officials cite dangerous heat‑index values as the primary reason for the warning, indicating that temperatures combined with humidity could reach levels that pose health risks.

The warning applies uniformly to all counties, meaning urban centers, coastal areas, and rural regions will all be subject to the same advisory. Residents are being reminded that prolonged exposure to high heat‑index readings can lead to dehydration, heat exhaustion, and heat stroke, especially for vulnerable populations such as the elderly and young children.

Emergency services and health agencies are prepared to respond to any incidents that may arise as a result of the extreme conditions. The timing of the warning coincides with traditional Independence Day celebrations, which often draw large crowds to outdoor venues and events across the state.

As a result, authorities anticipate that many people will be outdoors for fireworks displays, picnics, and parades during periods of heightened heat. The state’s weather monitoring teams will continue to track temperature and humidity trends throughout the warning period, updating the public as conditions evolve.

The extreme heat warning remains in effect until Saturday evening, after which officials will reassess the situation to determine if further action is needed. In the meantime, the advisory serves as a reminder that the combination of high temperatures and humidity can create dangerous environments, and that caution is warranted throughout the holiday weekend.