Long Island weather: Hot and muggy start to workweek

Temperatures approaching 90 degrees baked Long Island on Sunday, with more hot and steamy weather ahead this week and showers possible late Monday and again early Thursday, according to the National Weather Service.

A heat advisory issued by the weather service and set to end at 7 p.m. on Sunday was extended until 7 p.m. on Monday for Nassau and western Suffolk Counties.

After an overnight low of about 72, Monday's forecast calls for sunny skies and a high about 88. The heat index value will make it feel closer to 95.

"Monday is also going to be a similar day," James Tomasini, a meteorologist with the weather service's Upton office, told Newsday. "It will feel warm and humid outside ... With some greater chances for showers and thunderstorms" in the late afternoon and evening.

"Stay hydrated, and if you’re doing something active, take breaks in a shaded area if possible," Tomasini said. "It has been several days of this heat, so it’s very important to stay hydrated."

For those who work at outdoor jobs sites, the weather service advises people to take breaks as often as possible. Also, make sure all children and pets are not left in vehicles.

The weather service also encouraged people to drink beverages with electrolytes to protect against heat stress, apply sunscreen every two hours and wear lightweight, loose-fitting clothing.

On Tuesday and Wednesday, the high will in the mid to upper 80s, with a mix of clouds and sun. The next shot at rain comes early Thursday when there is a 30% chance of showers and thunderstorms, the weather service said.