Camp out in front of that air conditioner -- it's going to be a hot one this week.

Long Island won't get a break from the heat, as a high-pressure system is pushing temperatures well above normal, according to Joe Pollina, meteorologist with the National Weather Service's Upton bureau.

Sunday will see highs in the upper 80s, with a slight chance of showers and thunderstorms in the afternoon. Clouds will move in Sunday night, with lows in the lower 70s.

Monday begins a spate of hot, sunny weather, with highs that day in the low to mid-90s. Lows on Monday will be in the low 70s.

Tuesday will be sunny with highs in the low 90s and lows in the lower 70s. Wednesday will have highs near 90 and lows in the low to mid-70s.

Thursday will see highs in the low 90s with lows in the low to mid-70s.

advertisement | advertise on newsday

Friday will be slightly cooler, with highs reaching into the upper 80s to around 90. Lows on Friday will be in the mid-70s.

Pollina said high temperatures for mid-July are usually in the low 80s, with normal lows in the mid- to upper 60s. A high-pressure system off the East Coast is to blame, Pollina said.

"Things are going to heat up under that dome of high pressure," he said.