Welcome to the 90s.

No, this is not trip down memory lane, but temperatures of a heat wave expected to hit York County.

High temperatures of 90 on Thursday and in the mid 90s for Friday, Saturday and Sunday are predicted by both the National Weather Service and AccuWeather.com.

"We're heading into a heat wave this weekend," said Mike Pigott, AccuWeather.com's senior meteorologist. "With the humidity it's going to feel like 100 (degrees). Because it's hot and humid, we're watching out for showers or thunderstorms each afternoon this weekend."

The area will cool down a few degrees with Monday and Tuesday temperatures in the high 80s, said Tony Mach, National Weather Service meteorological technician.

Temperature in the low 90s is expected for Wednesday, July 4, he said.

"It will be mostly sunny and hot," Mach said.

A thunderstorm is possible for Independence Day, according to AccuWeather.com.

Normal temperature for that day is 85 degrees, Mach said. The record for July 4 is 102 in 1966, according to Pigott.

The upcoming holiday means plenty of outdoor activities including fireworks shows, cookouts and parades.

People who go outdoors can beat the heat by wearing light-colored, lightweight clothing and by staying in the shade or under awnings as much as possible. Drinking plenty of water and avoiding caffeine and alcoholic beverages also could help.

Children, senior citizens, people with special needs or pets should not be left alone in vehicles.

Residents who stay indoors can keep rooms well-ventilated by either keeping their windows open or using air conditioners and fans.

-Reach Eyana Adah McMillan at emcmillan@yorkdispatch.com.