Philadelphia, PA – An oppressive wave of heat will push Philadelphia’s temperature to a scorching 101°F by Wednesday afternoon, with the heat index nearing 106°F. The National Weather Service has issued an Extreme Heat Warning through 8 p.m. Wednesday for much of east-central and southeastern Pennsylvania — including the Philadelphia metro, Allentown, Norristown, and the I-76 corridor.
According to the National Weather Service in Mount Holly, the most dangerous conditions will develop midday Wednesday as southwest winds and high humidity trap heat across the region. Overnight lows will offer little relief, hovering near 80°F — putting added stress on vulnerable residents and those without air conditioning.
Heat-related illness can strike fast. Officials urge residents to stay indoors, avoid outdoor work during peak hours, and check on elderly neighbors. Car interiors can reach deadly temperatures within minutes. Do not leave pets or children unattended. Call 211 if you need help finding a cooling center.
Philadelphia-area roads, especially I-76, I-95, and Route 1, may see delays due to overheated engines and increased emergency calls. SEPTA riders should carry water and expect heat-related service slowdowns by late afternoon Wednesday.
The brutal heat begins to ease slightly Thursday, though high humidity will linger into the weekend with scattered storms in the forecast.
🔎 Five-Day Weather Outlook: Philadelphia, PA
Tuesday (June 24): Sunny and dangerously hot. High 101°F. Heat index up to 106°F. Light wind.
Wednesday: High 97°F, heat index up to 103°F. Slight chance of storms after 2 p.m.
Thursday: Showers and thunderstorms likely after 2 p.m. High near 91°F.
Friday: Chance of storms. High near 80°F. Cooler overnight.
Saturday: More scattered storms, high around 84°F. Muggy but manageable.
