Philadelphia/ Weather & Environment

Philly Sizzles Under Sun Today, Nighttime Thunderstorms Loom

AI Assisted Icon
Published on August 12, 2026
Philly Sizzles Under Sun Today, Nighttime Thunderstorms LoomSource: Google Street View

Philadelphia is waking up to mostly cloudy skies and temperatures around 77 degrees Wednesday, but the cloud cover will not last: The city is headed for a mostly sunny afternoon near 88. A stray shower is possible before 8 a.m., though most of the day should stay dry.

Winds should remain light, generally 0 to 5 mph, with a north wind turning west later. The National Weather Service puts the morning rain chance around 20% and says any new rainfall should be less than a tenth of an inch.

Thunderstorms Could Roll In After Dark

Philadelphia’s unsettled stretch returns Wednesday night, with showers and thunderstorms possible from about 8 p.m. through the overnight hours. The chance of rain rises to 40%, and the forecast calls for roughly a tenth to a quarter inch of rain where storms pass.

Coverage and timing remain uncertain, but the forecast discussion says the overall severe-weather threat should be limited. Lightning and brief heavy downpours could still complicate outdoor plans and late-night travel.

Cooler, Drier Weekend Follows

Thursday stays hot near 89 with a slight morning shower chance, while Friday reaches about 87 with a few showers possible. The pattern finally turns more comfortable Saturday, when sunshine and an 86-degree high are expected.

Sunday brings another chance of showers, followed by likely showers and thunderstorms Sunday night; Monday remains warm near 86 with another 40% rain chance. For now, the best outdoor window looks like Saturday, while anyone making plans Wednesday night should keep an eye on the sky.