They also say drink plenty of fluids.
With the heat and humidity expected to last through the week, health officials are urging residents to take precautions. "Try to limit your outdoor activity during the day. Take frequent breaks. Go into the shade. Drink plenty of fluids," says Dr. John Molesworth, an emergency room physician at Frederick Memorial Hospital.
The forecast calls for temperatures in the 90's through the week, with high humidity. "The body basically loses its ability to regulate itself," says Dr. Molesworth, on how the heat and humidity affect the human body. "Once you've lost a lot of fluid, the core body temperature can raise very quickly."
This can also lead to heat stroke, he says. The symptoms include dizziness and nausea. If you feel ill after being out in the heat, get medical attention immediately.
Health officials urge residents to stay indoors where it's air conditioned. "And if you're one who cannot avoid the heat and have to be out in it, it's that much more important to have plenty of water available. And it's not just a matter of drinking it when you're thirsty, but drinking it when you can," says Accuweather meteorologist Bob Larson.
"During times of extreme humidity, the body loses its ability to cool itself through perspiration. Normally, perspiration will cause a cooling affect over the body. But when it is very humid, the moisture does not evaporate," Larson says.
While health officials urge you to drink plenty of fluids, alcoholic beverages, such as beer, are not recommended. "Alcohol can cause you to lose more body fluids. And it also can impair your judgment in how you take care of yourself outside," says Dr. Molesworth.
He also recommends you do your outdoor exercises during the early morning or the evening to avoid the extreme heat in the middle of the day. "Obviously, wear very light clothing. Cotton, for instance, is very bad. It holds heat. A lot of the lighter fabrics they offer now are a much better choice," he says.
As you're looking after yourself during these extreme temperatures, both Larson and Dr. Molesworth urge you to check up on those most vulnerable to heat and humidity, such as the elderly and the very young.
Dr. Molesworth says as of Monday, no patients with heat-related emergencies have come into the FMH Emergency Room.