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Sunday Forecast Update
Posted Sunday 10/19/25 @ 8:42 AM — We’ll have sunny skies through high cirrus clouds today. Thickening cloudiness is expected from west to east between 5 PM and 7 PM. The winds and wind gusts will be increasing this afternoon during the Eagles game and gusts in the range of 30-40 mph will become increasingly likely, especially after 10 PM as the cold front moves through.
The model guidance has backed off on the heavy rain for tonight (after midnight); surface low pressure along the front is expected to develop in southern New England, robbing our area of the energy (and the heavier rain). As always, there’s a range of rainfall amounts from model to model, but the overall range is from 0.20″ to perhaps 0.45″. Locally heavier amounts possible, occurring between midnight and 3 AM.
While clearing is expected early morning, the negatively tilted upper air low may cause some instability cloudiness to develop Monday, late morning into the afternoon, especially from the city northward.
Saturday Update
Posted Saturday 10/18/25 @ 10:01 AM —
A fasting moving sharp line of showers and storms is still forecast for the hours after midnight Sunday into Monday morning.
Originally Posted Fri 6:06 PM —An upper level ridge and high pressure will bring mostly sunny skies and milder temperatures through the weekend. A brief exception will be a bit of cloudiness mid-day Saturday. Things change abruptly after midnight Sunday into Monday with a line of heavy showers.
A cold front moves through Sunday late evening/night. The models have been consistent with this forecast and a slight change has been for the main area of precipitation to move through a bit later, about 9-11 PM. It’s also appearing that a line of heavy showers/thunderstorms may move through 1AM Monday morning with high winds.
Saturday
Sunny early. Some mid-level cloudiness especially western and northwestern sections late morning into early afternoon as a mid-level disturbance moves through over the upper level ridge. Clouds dissipate later in the afternoon.
High Temperatures— Blue Bell: 69º Philadelphia 70º
Very low uncertainty based on standard deviation ± 0.6º
Sunday
Sunshine through high cirrus clouds and mild in the afternoon. Quite breezy/windy early afternoon becoming very windy by evening.
High Temperatures Blue Bell: 76º Philadelphia 77º
Very low uncertainty based on standard deviation ± 0.6º
Sunday night into Monday
Strong wind gusts…briefly strong rain squall with embedded thunderstorms moves through between midnight and 3 AM Monday morning. Rainfall amounts have risen to about 0.4-0.6 inches with locally higher amounts.