Philly Weekend Weather Forecast

High pressure over our area is gradually moving east and a return southerly flow of warm humid air will bring an increasing chance of showers by Sunday.  The remnants of tropical storm Nate will also enter the mix from late Sunday into Monday.

Saturday will be partly sunny in the morning, with increasing cloudiness in the afternoon. High 80.

For Sunday, there’s more uncertainty in the forecast—

With a tropical system in the mix, there is the inherent uncertainty about the  moisture track and timing in the picture— the NAM and GFS differ significantly with the timing of Nate’s appearance in our area. The GFS has light showers Sunday morning, then low chances of precipitation until the evening, while the NAM holds back the rain until well into Monday.

Some of the newer statistical models show a good chance of showers throughout the day Sunday and I’m going with this for now. Sunday will be cloudy, humid and warm with showers and highs near 79.