Pittsburgh heat – A heat wave will bring record-level heat to Pittsburgh and parts of the Eastern U.S., with temperatures expected to reach 100 degrees around July 2 and an extreme heat risk continuing through Independence Day, when a storm chance returns.
By the time many Pittsburghers head toward Independence Day plans, the air may already be doing damage.
The National Weather Service says a heat wave sweeping across the Midwest and Eastern U.S. after the June 27–28 weekend is expected to last at least through July 4, with Pittsburgh climbing into triple digits and humidity making the conditions more punishing than the thermometer suggests.
In Western Pennsylvania, forecasters expect temperatures in the upper 90s with high humidity throughout the week, and the possibility of 100 degrees in Pittsburgh just two days before Independence Day.
The heat is arriving as the nation heads into America’s 250th anniversary—an especially sharp contrast for anyone planning outdoor routines. barbecues. parades. or fireworks. The risk isn’t just discomfort. The NWS warns that the combination of high temperatures and moisture in the air can rapidly raise the danger of heat exhaustion or heat stroke.
Temperatures and forecast highs for Pittsburgh
The NWS forecast shows temperatures building toward a peak and then holding near triple digits as July 4 approaches:
Monday, June 29: High of 90, low of 71.
Tuesday, June 30: High of 94, low of 76.
Wednesday, July 1: High of 98, low of 76.
Thursday, July 2: High of 100, low of 77.
Friday, July 3: High of 98, low of 76.
Saturday, July 4, Independence Day: High of 94, low of 72.
Sunday, July 5: High of 91.
How hot will it feel
Heat doesn’t hit the body all at once; it builds. The NWS notes that temperatures over 99 can lead heat to start accumulating in the body, while higher humidity makes it harder for sweat to evaporate—one of the body’s main cooling tools.
The weather service describes an “extreme heat risk” across Pittsburgh ahead of and through Independence Day. Under that designation, the weather is dangerously hot and could quickly result in heat exhaustion or heat stroke, particularly with prolonged time outdoors.
The same calculations behind the warning factor in the highest maximum temperatures in the area and the effects of humidity.
Rain chances for July 4
For anyone hoping the holiday would come with a break in the heat, the early week forecast is mostly clear. The NWS says the days leading up to Independence Day are expected to be sunny and hot with next to no chance of rain.
Over the next few days, forecasters say the pattern looks like this:
Monday, June 29: Mostly sunny following fog in the morning. Tuesday, June 30: Mostly sunny. Wednesday, July 1: Sunny. Thursday, July 2: Sunny. Friday, July 3: Sunny. Saturday. July 4. Independence Day: 40% chance of rain. with a chance of showers and thunderstorms during the day and into the evening. Sunday, July 5: 40% chance of rain, with a chance of showers and thunderstorms.
As the forecast turns from steady sunshine to a storm chance on Independence Day, the warning remains the centerpiece: the heat and humidity are expected to drive the risk first, with weather that may finally shift only after temperatures have already peaked in the days before July 4.
Pittsburgh heat wave July 4 forecast NWS heat warning extreme heat risk record temperatures humidity heat exhaustion heat stroke rain chance July 4