Philadelphia/ Weather & Environment

From Fog to Fall Sizzle: Philly Skies Flip From Isaias Gloom to Sunny 70s

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Published on October 12, 2026
From Fog to Fall Sizzle: Philly Skies Flip From Isaias Gloom to Sunny 70sSource: Google Street View

Philadelphia starts Monday with clouds, patchy fog and a chance of showers or thunderstorms, but the messy opening should give way to a brighter afternoon. Temperatures are expected to climb to around 74 degrees as the remnants of Isaias pull away and the sky gradually clears.

The National Weather Service calls for the best chance of rain before 8 a.m., followed by mostly sunny skies and north winds around 5 to 10 mph. Monday night should be partly cloudy, with temperatures dipping to about 58 degrees.

Sunny Stretch Builds Through Wednesday

Tuesday looks mostly sunny and warmer, with a high near 79 and light southwest winds. Wednesday could be the warmest day of the week, reaching about 82 degrees under sunny skies.

Thursday brings a more seasonable high near 70 with mostly sunny conditions during the day. Shower and thunderstorm chances increase late Thursday night, with a 50% chance of precipitation after 2 a.m.

Rain Returns Before Weekend Chill

Friday is shaping up to be unsettled, with a chance of showers and thunderstorms, mostly cloudy skies and a high near 75. The temperature then drops quickly Friday night, when rain showers remain possible and the low falls to around 48.

The weekend will feel much more like fall, with gusty northwest winds and a high near 54 Saturday. Saturday night could drop to around 40 before sunny skies return Sunday, when temperatures should reach the upper 50s.

The sharp swing from Wednesday's summerlike warmth to Saturday's brisk chill is a notable change from Hoodline's earlier forecast. For now, outdoor plans have a friendly window from Monday afternoon through Wednesday, while Friday and the weekend call for a closer look at the hourly forecast.