PHILADELPHIA, Pennsylvania — If you have outdoor plans for Sunday evening, it is time to rethink them.
A multi-round rain event is moving into the Philadelphia region, and the later half of the day is where the real concern sits. What starts as a wet Sunday could turn into a flash flooding situation for parts of the area by nightfall.
When the heaviest rain hits
The most dangerous window is Sunday evening into overnight.
Rainfall totals of 1 to 2 inches are expected during this stretch, with some spots seeing even more. Urban areas and neighborhoods where water already drains slowly are at the highest risk of localized flash flooding.
The overall severe threat remains limited — but do not let that create a false sense of security if you live in a low-lying or flood-prone area.
Southern New Jersey and Delaware — watch closely
Residents near the warm front, particularly across southern New Jersey and Delaware, could see a few stronger storms move through.
These areas should pay close attention to local alerts Sunday afternoon and evening. Conditions can change quickly near a warm front, and storm intensity can exceed what broader forecasts suggest.
What comes after the rain
Monday may start with a few lingering showers very early, but the sun returns by late morning into the afternoon.
Tuesday and Wednesday bring a welcome break — dry, less humid, and generally quiet. After a rough Sunday night, those two days will feel like a reset.
The next weather system is already on the way
Enjoy the midweek calm, because another cold front approaches Thursday into Friday.
That system brings the next round of showers and storms, though forecasters are still working out the timing and whether any severe or flooding threat will develop.
Behind that front, temperatures drop roughly 5 degrees heading into next weekend — a noticeable cooldown compared to the heat midweek.
Your 7-day forecast at a glance
Sunday: Heavy rain alert — High 80, Low 71
Monday: Clearing skies — High 90, Low 72
Tuesday: Mostly sunny — High 89, Low 74
Wednesday: Nice day — High 90, Low 69
Thursday: Chance of rain — High 87, Low 74
Friday: Rain and storms — High 80, Low 70
Saturday: Chance of showers — High 81, Low 69
Are you in a flood-prone area in the Philadelphia region? Drop your location in the comments and let neighbors know what conditions look like on the ground — your update could help someone nearby stay safe.