Philadelphia Weather Outlook

THIS WEEK’S WEATHER

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Friday Forecast and Weekend Preview

Posted Thursday 11/13/25 @ 7:52 PM — Friday will feature more sun, less wind (although still somewhat windy) and similar high temperatures as we had Thursday (52º-54º). The day will start out colder, with temperatures hovering around the freezing mark, higher in the immediate city.

Saturday: A storm to our north and an associated cold front will bring clouds fairly early on Saturday but it will be mild (56º-57º). Most of the day will be cloudy. Showers move in ahead of the cold front as early as 5 PM in western Montco/Bucks/Chester counties. Most areas will see the rain between 7 and 9 PM.

18z GFS Simulated Radar forecast for 5 PM Saturday. The GFS is earlier with the rain than most of the models. (Click on image for a larger view.)

Sunday: The rain ends before daybreak. Temperatures fall slowly during the day. It will be quite windy and gusty (gusts 35 mph-40 mph). Winds drop off for the Eagles game Sunday night. Start time temperature around 45º ± 3.5º

Thursday Forecast

Posted Thursday 11/13/25 @ 9:21 AM — Despite the promise of abundant sunshine heard on last night’s TV broadcast, the models are consistent in forecasting a weak upper air disturbance and minor cold front/wind shift that moves through about noon today. We will likely see considerable cloudiness for a duration of 3-4 hours again today, starting around noon and dissipating about 3-4 PM. This area of cloudiness will affect locations from the city northwestward, but will dissipate in NJ and likely won’t affect far southern sections

Satellite Image 9 AM toady with superimposed RAP model and radar. Area of Omega will move through Philadelphia around noon with an increase in cloudiness. (Click on image for a larger view.)

This weak disturbance will bring in colder weather tonight and Friday.

A warm up on Saturday followed by a cold front Saturday night is in the forecast.

Tuesday Forecast

Posted Tuesday 11/11/25 @ 8:29 AM — The cold air will be with us through today, but temperatures can be expected to moderate to the low 50s through the week.

Model Blend meteogram for grid point KLOM (Blue Bell) Temperatures, Wind Chill and Dew Points through Friday. (Click on image for a larger view.)

The cold air has set off some lake effect precipitation in northwest PA and some cloudiness associated with this effect and with thermal instability will move in to our area by noon, as we saw on Monday.

It will be very windy and gusty today with gusts exceeding 35 mph.

8:30 AM Visible Satellite with superimposed RAP model MSL pressure, HRRR pressure tendency and NexRAD radar (Click on image for a larger view.)
Monday Forecast

Posted Monday 11/10/25 @ 9:39 AM — The cold front moved through but a lingering line of instability showers is moving through right now—

9:35 AM Visible Satellite with superimposed radar and RAP model pressure with station surface readings. (Click on image for a larger view.)

Some showers followed by partial clearing in southern areas for late morning. The models are showing the re-development of clouds in the afternoon due to instability from cold air aloft.

We will reach peak temperature today around noon (~51º) and temperatures will start dropping about 1 PM into the night. Winds will pick up later in the afternoon.

Tuesday will have partial sunshine and quite windy. Details to follow later.

Mon 9:47 AM —Forecast Review — The rains came last night as expected in two major bands, although the rainfall amounts were much higher than had been overall forecast. Here’s the MRMS rainfall summary—
MRMS rain-gauge measured rainfall combined with rain-gauge calibrated and interpolated radar-based summary of ACTUAL RAINFALL RECEIVED. Color shading is in inches. Line contour numbers are in mm. (25.4 mm= 1 inch)      (Click on image for a larger view.)

Originally Posted Sun 8:36 PM —A cold front will move through tonight (Sunday night) and showers are again predicted to move through the area in elongated bands. Here’s the current radar/MRMS—

Radar at 7:05 with RAP model superimposed low level Omega. The showers may fall apart as they approach, as there is an unfavorable environment just north of the city. (Click on image for a larger view.)

Some areas may receive as much as 1.30″ of rain but many areas will receive less than 0.20″.

Today’s 18z RRFS total rainfall forecast for Sunday evening. A low confidence forecast. (Click on image for a larger view.)

The highly amplified jet stream dip will bring cold air to our area by Monday night into Tuesday.

Highs on Monday will occur about noontime; temperatures will fall during the afternoon and into the night.

Current NBM forecast low temperatures by 7 AM Tuesday morning—

NBM model forecast low temps by Tuesday 7 AM (Click on image for a larger view.)