Philadelphia will climb into the low 90s Friday with a code‑orange air‑quality alert in effect. Scattered storms may arrive late Saturday night.

A PNAS Nexus paper finds artificial light at night lengthens pollen seasons and increases severe pollen days in Northeastern cities, raising allergy risks for urban residents.

Sunny and warm Thursday in Philadelphia with highs near 89°F and low 90s Friday–Saturday. Showers and thunderstorms are likely late Saturday night into Sunday.

Sunny and dry through Friday with highs near 85; low 90s expected Friday–Saturday. Showers and storms become more likely Sunday.

Mostly clear Tuesday with highs near 77°F. A warming trend brings 80s and low 90s later this week.

Sunny, mild inland with highs near 76°F. Ocean County beaches are under a HIGH rip current risk this evening.

Gusty northwest winds arrive midday; Small Craft Advisories are in effect for Delaware Bay and offshore waters.

Sunny and mild Friday with highs in the upper 70s. Gusty northwesterly winds arrive Saturday — mariners and beachgoers take note.

Mostly sunny this afternoon with breezy northwest gusts near 30 mph and a Small Craft Advisory for the upper Delaware Bay.

Morning showers and patchy fog with a humid push to the low 80s; storms mainly to the south. Drier, sunnier weather returns by Thursday.

Dense fog reduced visibility across parts of Philadelphia this morning; a Dense Fog Advisory is in effect and could slow commutes.

Fog and light rain greet Philadelphia on Memorial Day, with showers and a HIGH rip current risk at area beaches. Allow extra travel time and check beach warnings.

Philadelphia's city-run mussel hatchery is scaling up to seed rivers with living filters that may help make the Schuylkill and Delaware swimmable and fishable again.