PHILADELPHIA | Philadelphia readers should plan for dangerous heat, a high near 98°F and a chance of isolated showers and thunderstorms later in the day, according to official National Weather Service forecast data.
Today and tonight
Philadelphia: Today — Sunny, then isolated showers and thunderstorms after 3 p.m.; high near 98°F; southwest wind 5 to 10 mph; heat index values as high as 106. Chance of precipitation is 20%. Tonight — Isolated showers and thunderstorms before 9 p.m., then mostly clear; low near 77°F; southwest wind 5 to 10 mph; heat index values as high as 105 early in the evening. Chance of precipitation is 20%.
Planning notes
The heat is the main reader-service concern. People working outside, waiting at transit stops, attending camps, caring for children or older adults, or traveling without reliable air conditioning should treat the heat index as the practical number for planning. A forecast high in the upper 90s can feel substantially hotter when humidity is high.
The isolated thunderstorm risk is limited, but it matters for outdoor events because a single storm can produce lightning, brief downpours and sudden changes in road conditions. Readers should be prepared to move indoors quickly if thunder is heard or if the National Weather Service issues updated statements.
Safety reminders
Drink water regularly, use air conditioning when available, check on older neighbors and people without reliable cooling, limit strenuous outdoor activity during the hottest part of the afternoon and never leave children or pets in vehicles. Event organizers should make shade, water and cooling breaks part of the plan rather than an afterthought.
Forecasts can change quickly. Readers should check current National Weather Service forecasts, warnings and local emergency information before making travel, school, work or event decisions.
Additional Reporting By: National Weather Service Philadelphia/Mount Holly Forecast; National Weather Service Philadelphia/Mount Holly; NOAA; Heat.gov