New Jersey is facing a blast of heat and humidity on the first day of summer.

Forecasters including Townsquare Meteorologist Alan Kasper are predicting high temperatures in the mid to upper 90s on Wednesday. Combined with humidity, it could feel like it's 100 to 104 degrees.

There might be little relief in the evening, when low temperatures could be in the 70s.

Forecasters say the beaches might offer some relief from the heat.

The National Weather Service has already issued an excessive heat warning from 1 p.m. Wednesday until 6 p.m. Friday for Mercer, Gloucester, Camden and northwest Burlington counties.

Officials are advising people to drink plenty of water, avoid strenuous activity outside and turn on the air conditioner.

Child Safety Heat Tips

Make sure your child's safety seat and safety belt buckles aren't too hot before securing your child in a safety restraint system, especially when your car has been parked in the heat.

Never leave your child unattended in a vehicle, even with the windows down.

Teach children not to play in, on, or around cars.

Always lock car doors and trunks--even at home--and keep keys out of children's reach.

Always make sure all children have left the car when you reach your destination.


Adult Heat Wave Safety Tips


Slow down. Reduce, eliminate or reschedule strenuous activities until the coolest time of the day. Children, seniors and anyone with health problems should stay in the coolest available place, not necessarily indoors.

Dress for summer. Wear lightweight, light-colored clothing to reflect heat and sunlight.

Put less fuel on your inner fires. Foods, like meat and other proteins that increase metabolic heat production also increase water loss.

Drink plenty of water, non-alcoholic and decaffeinated fluids. Your body needs water to keep cool. Drink plenty of fluids even if you don't feel thirsty. Persons who have epilepsy or heart, kidney or liver disease, are on fluid restrictive diets or have a problem with fluid retention should consult a physician before increasing their consumption of fluids. Do not drink alcoholic beverages and limit caffeinated beverages.

During excessive heat periods, spend more time in air-conditioned places. Air conditioning in homes and other buildings markedly reduces danger from the heat. If you cannot afford an air conditioner, go to a library, store or other location with air conditioning for part of the day.

Don't get too much sun. Sunburn reduces your body's ability to dissipate heat.

Do not take salt tablets unless specified by a physician.

The National Weather Service contributed to this story.