PHILADELPHIA — An extreme heat warning remains in effect across the Philadelphia region Friday as heat index values soar above 105 degrees, with scattered thunderstorms possible later in the day and into the weekend.
The National Weather Service issued the warning from 10 a.m. to 9 p.m., covering Philadelphia, surrounding suburbs, and parts of South Jersey and northern Delaware. Forecasters expect a high of 97 degrees Friday, with heat index values peaking at 106 to 107, driven by hot temperatures and high humidity.
“Dangerously hot conditions with heat index values up to 107 degrees expected,” the advisory reads.
In addition to the oppressive heat, the forecast includes a 30% chance of thunderstorms after 4 p.m. today, increasing to 40% this evening. Rainfall totals are expected to remain light, although higher amounts are possible in isolated thunderstorms.
Overnight, skies will be mostly cloudy with a low around 76.
Saturday brings modest relief with a high near 89 and partly sunny skies. Winds will shift from the northeast to southeast, and overnight temperatures will drop to around 72. Another round of storms is possible late Saturday night, with a 40% chance of showers and thunderstorms after 2 a.m.
Rain becomes more likely on Sunday, with a 60% chance of showers and thunderstorms, mainly in the afternoon and evening. Highs will dip to the mid-80s, with calm winds turning southerly. The unsettled pattern continues Sunday night, with a chance of lingering storms and a low around 73.5
