Philadelphia/ Weather & Environment

Rain-Soaked Sunday in Philadelphia Kicks Off Cool, Dreary Week

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Published on September 20, 2026
Rain-Soaked Sunday in Philadelphia Kicks Off Cool, Dreary WeekSource: Peetlesnumber1 / Wikimedia Commons

Philadelphia is waking to a wet Sunday, with a wetter day ahead. Rain is expected Sunday, and the National Weather Service forecast indicates little instability and generally no embedded convection in Sunday's rain. The bigger shift comes after today, when cooler temperatures and repeated rain chances settle in for much of the week.

The National Weather Service expects rain Sunday, with winds changing as the system moves through. Showers may linger into Sunday evening. Philadelphia's current forecast lists no watches, warnings or advisories.

Sunday Rain Gives Way To A Cooler Monday

Rain remains possible Sunday night. Across the region, rainfall is possible from Saturday night through Monday.

Monday will be cooler, with showers possible. Rain showers may continue Monday night.

Tuesday Could Bring The Week's Heaviest Rain

Tuesday could bring showers and breezy northeast winds.

Rain showers remain possible Wednesday, with another possible rain event Thursday. Rain may also be possible Friday.

Late-Week Coastal Low Bears Watching

Forecasters are still uncertain about a potential coastal low later in the week, but its track could bring additional rain and gusty winds to the region Thursday and Friday. The system could also raise the risk of tidal flooding as full-moon tides build toward Saturday, particularly in vulnerable coastal and tidal areas.

For Sunday, the simplest plan is the best one: keep an umbrella close, watch for wet pavement and expect the weather to become cooler and more unsettled after the rain moves through.