As of 5:35 a.m. Wednesday, July 1, skies over Philadelphia were partly cloudy and the official reading at Philadelphia International Airport was sitting near 73°F. The city is headed for a scorcher today, with forecasters calling for a high near 98°F and heat index values pushing into the mid‑100s. Overnight lows will only fall into the mid‑70s, setting up several consecutive days of dangerous heat through the Independence Day weekend.
When The Heat Peaks
The National Weather Service has issued an Extreme Heat Warning for the region, in effect from noon Wednesday, July 1, through 8 p.m. Saturday, July 4, according to NWS Mount Holly. Highs are expected to climb from the upper 90s today into the 100 to 105°F range on Thursday and Friday, with heat index values commonly landing between 100 and 110°F. Daily high temperature records could be challenged late this week. Isolated afternoon storms may pop up, but they are not expected to bring broad or lasting relief from the heat.
City Response And Legal Steps
City health officials have declared a Heat Health Emergency and say more than 50 cooling centers will operate with extended hours. The Philadelphia Corporation for Aging’s Heatline is available at 215‑765‑9040 for older residents and caregivers, the city said in a press release. The declaration also pauses Philadelphia Water Department shutoffs during the emergency and activates outreach teams, hydration stations, and extra services around major events. For full locations and hours, call 311 or see the city's press release from the City of Philadelphia.
Storms, Air Quality And The Holiday Outlook
Isolated showers and thunderstorms are possible each afternoon, with a higher chance for more widespread storms late Friday into the holiday weekend. Forecasters warn that any storm that does form could bring gusty winds and frequent lightning. The local warnings page also notes a Code Orange air quality alert for ozone and fine particles, which means sensitive groups should limit strenuous outdoor activity during the hottest parts of the day. Organizers and families should plan for both oppressive heat and the possibility of afternoon lightning on Saturday and Sunday.
How To Stay Safe
Residents are urged to drink plenty of water, avoid direct sun between about 11 a.m. and 6 p.m., and use air-conditioning whenever possible. Public cooling centers, pools, and spraygrounds are available for those without AC. Check on older neighbors and anyone who may be vulnerable. Outreach and shelter help for people living outdoors is available at 215‑232‑1984, and in medical emergencies call 911. For locations, updates, and city alerts, call 311 or text READYPHILA to 888‑777.
