A hot summer is about to get hotter still as its fourth major heat wave hits Friday and Saturday.
The National Weather Service forecasts high temperatures of 92 tomorrow and 91 Saturday.
It also expects heat indexes in the mid-90s, with especially high humidity on Saturday.
"On Saturday the dew point will be 68, that's uncomfortable, some people say 'muggy,'" said Lou Giordano, a meteorologist at the National Weather Service in Moon.
He said a normal dew point for this time of year would be 60.
The city of Pittsburgh announced today that senior centers in Greenfield, Homewood, the South Side and Sheraden will extend their closing times to 7 p.m. Friday and Saturday. The centers offer seniors a place to cool off and find refreshments and games, the city said.
Thunderstorms on Sunday are expected to bring temperatures back down, with a high of 84 that day, according to the National Weather Service.