Philadelphia/ Weather & Environment

Rain-Soaked Philly Braces as Delaware River Tidal Flood Threat Rises

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Published on September 23, 2026
Rain-Soaked Philly Braces as Delaware River Tidal Flood Threat RisesSource: Peetlesnumber1 / Wikimedia Commons

Philadelphia is waking up to early showers Wednesday, with a high near 65 later in the day. Light rain over Delmarva and far southern New Jersey should dissipate by 9–10 a.m. Northeast flow will bring breezy or gusty conditions.

Rain Fades, Wind Hangs On

The rest of Wednesday is expected to remain mostly cloudy and mostly dry. Temperatures will climb through the 60s, while northeast flow continues Wednesday night.

Thursday brings a similar setup, with mostly dry conditions and a high near 66. Northeast flow will persist. It will feel more like an early-fall day than a late-September warmup.

Coastal Flood Advisory Begins Wednesday Night

Coastal Flood Advisories for the tidal Delaware River remain in effect through Thursday night's high tide. The National Weather Service forecasts multiple rounds of tidal flooding, including minor flooding along the tidal Delaware River.

Showers Return For The Weekend

Friday brings a chance of rain showers, with unsettled weather continuing into the weekend.

The coastal flooding concern is the latest addition to a week already trending cooler, windier and wetter than the last Philadelphia forecast update.