Philadelphia, Pennsylvania – Sweltering heat will grip Philadelphia Friday, July 18th, with heat indices soaring near 103°F and potential summer thunderstorms threatening weekend plans across the city and southeastern Pennsylvania. Residents and commuters, especially along I-95 and the Schuylkill Expressway, should brace for dangerous midday heat and possible delays from Friday afternoon storms.
According to the National Weather Service, Friday’s high of 86°F will feel even hotter due to elevated humidity, pushing heat index values over 100°F in the city. Scattered storms may pop up Friday afternoon, bringing brief downpours and gusty winds that could disrupt evening travel and outdoor activities. Residents are urged to limit time outdoors, stay hydrated, and check on vulnerable neighbors.
Saturday brings a slight break, but showers and a few thunderstorms remain possible, especially after 5 p.m. While highs back off to the upper 80s, humidity will linger and skies stay partly sunny. The risk of rain ramps up again Saturday night, with more widespread showers and isolated storms likely to develop—potentially impacting late-night drivers and early Sunday plans.
Sunday keeps Philadelphia unsettled, with a 40% chance of showers and thunderstorms during the day. Partly sunny skies will persist, but summer weather remains active and unpredictable. Thunderstorm chances gradually decrease by Sunday night as slightly cooler, drier air returns to the region.
What’s Next?
Monday and Tuesday will deliver classic summer weather—mostly sunny skies, highs in the upper 80s, and comfortable overnight lows in the upper 60s. By midweek, expect another surge of sunshine and seasonably warm temperatures. Stay alert for updated advisories through the weekend, especially if planning to travel the I-95 corridor or enjoy outdoor events.
Five-Day Philadelphia Area Forecast (Friday, July 18th – Wednesday, July 23rd):
- Friday: Mostly sunny, high 86°F. Heat index up to 103°F. Slight chance of afternoon thunderstorms.
- Friday Night: Partly cloudy, low 76°F.
- Saturday: Partly sunny, high near 87°F. Afternoon and evening showers or storms possible.
- Saturday Night: Showers and thunderstorms likely, low around 73°F.
- Sunday: Partly sunny, chance of storms (40%), high near 88°F.
- Sunday Night: Partly cloudy, chance of storms early, low 69°F.
- Monday: Mostly sunny, high 85°F.
- Monday Night: Mostly clear, low around 67°F.
- Tuesday: Sunny, high 88°F.
- Tuesday Night: Partly cloudy, low around 70°F.
- Wednesday: Mostly sunny, high 88°F.
