Philadelphia Area Weather Forecasts

WEEKEND WEATHER FORECAST

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Updated Saturday 08/15/26 @ 8:38 PM — The models have showers moving in from the southwest between noon and 2 PM on Sunday. It would not surprise me if some scattered showers move in earlier – late morning.

Heavier widespread rain is likely by 4-6 PM. There’s a large spread in forecast total rainfall from 0.63” to over 2.1”.

Originally Posted Fri 9:51 PM — Very warm humid air just to our south will be blocked from advancing northward on Saturday by high pressure.

A low pressure system, currently developing in the Midwest will move east to be over our area late Sunday.

Water Vapor image at 4:51 PM with superimposed RAP model MSL pressure (black contours), 500-1000mb Thickness (yellow contours) , GFS potential vorticity contours (violet fine contours) with MRMS Radar and surface wind barbs, Low pressure will organize and move towards us on Sunday. (Click on image for a larger view.)
Saturday

Mostly sunny, although sunshine will be a bit dimmed by considerable wildfire smoke. Highs (Model Blend): Blue Bell- 87º Philadelphia 89º -90º ±2.7º Slightly above average standard deviation and uncertainty.

Sunday

Low pressure moves directly over our area.

Cloudy. Showers and thunderstorms move in from the west, as early as noontime and as late 3 PM Highs (Model Blend): Blue Bell- 87 º Philadelphia 88º ±2.0º Average sd and uncertainty.

The models continue to predict hot weather for Monday and Tuesday. Highs in the low 90s Monday and mid 90s Tuesday!.