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Nice Saturday in Philadelphia region, tracking heavy rain Sunday. Here's the weather forecast.

Saturday is DEFINITELY the day to get your outdoor things done in the Philadelphia region. There will be plenty of sun, relatively low humidity levels and warm summer heat, which will be great for beaches, pools, water parks, etc. 

Sunday morning a few sprinkles and isolated showers are possible. By the afternoon, have a plan to head indoors as scattered thunderstorms and heavy rain develop. Several inches are possible, and there is a flash flood concern.

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CBS News Philadelphia

NEXT big weather changes

Humidity will surge ahead of showers and storms arriving Sunday afternoon and evening.

Several inches of rain are possible, leading to a flash flood risk for anyone under a thunderstorm.

There is also a chance that a few storms may briefly turn severe. Damaging wind gusts would be the threat. 

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CBS News Philadelphia

Shower and storm chances may linger into Monday, with drier air likely arriving again Tuesday. Next week looks to be hot with increasing humidity, and several days without storm chances. Summer's not over yet, so enjoy while you can!

By the way, the sun now sets in the 7 p.m. hour and will not set again in the 8 p.m. hour for another eight and a half months.

Meteorological summer ends in 16 days on Sept. 1, and astronomical summer ends in 38 days on Sept. 22 at 8:05 p.m. EDT in Philadelphia.

Here's your 7-day forecast:

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CBS News Philadelphia

Saturday: Mostly sunny. High 90, Low 72

Sunday: NEXT Weather Alert for heavy rain. High 82, Low 71

Monday: AM shower. High 90, Low 73

Tuesday: Nice day. High 88, Low 72

Wednesday: Sunny and humid. High 90, Low 68

Thursday: Scattered storms. High 90, Low 75

Friday: Chance of storms. High 85, Low 70

NEXT Weather Radars

Hourly Forecast

Get the latest weather info on the CBS News Philadelphia app.

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