Philadelphia/ Weather & Environment

Flash-Flood Fury: Philly Faces Sunday Morning Soaker Before a Changeable Week

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Published on September 13, 2026
Flash-Flood Fury: Philly Faces Sunday Morning Soaker Before a Changeable WeekSource: InSapphoWeTrust / Wikimedia Commons

Philadelphia is waking up to cloudy skies, muggy air and a serious Sunday morning storm threat. Showers and thunderstorms could bring heavy rain before the city turns warmer and partly sunny later in the day.

Flood Watch Runs Through Sunday Morning

The National Weather Service has a Flood Watch in effect for Philadelphia and nearby parts of southeastern Pennsylvania through noon Sunday. Rainfall of 1 to 2 inches is possible, with heavier bursts creating flooding risks in low-lying areas, along small streams and across the city’s urban drainage system, according to the National Weather Service.

Showers and thunderstorms are expected to continue through late morning, with the greatest concern during the early-morning period. Residents should avoid flooded roads and be ready for rapidly changing conditions while the watch remains active.

Sunshine Returns Sunday Afternoon

The rain should taper by late morning, with clouds gradually breaking as temperatures climb toward 84 degrees. Winds will be west-northwest at 5 to 10 knots, and the afternoon forecast calls for partly sunny to mostly sunny skies.

Sunday night looks mostly clear with a low near 69 degrees. The sharper storm threat marks a notable update from Hoodline’s earlier forecast, which had already flagged the weekend as the next major weather turn.

Cooler Monday Before A Warmup

Monday brings a clean reset, with sunny skies and a low around 56 Monday night. Tuesday stays sunny with a high near 85, while Wednesday's high is around 86.

Heat gradually returns Thursday, with a chance of thunderstorms. A chance of showers and thunderstorms arrives Thursday night, with possible showers and storms into Friday, but the immediate concern is Sunday morning’s heavy rain and flooding potential.