CWS Forecast: Southeast Pennsylvania (Philadelphia)

A somewhat active pattern is expected for the Commonwealth this week. Scattered thunderstorms are possible on Monday, especially in the evening and overnight. Widespread thunderstorms are likely on Tuesday associated with an unseasonably strong low pressure system. Damaging winds are possible with stronger storms on both days. Thunderstorms remain possible on Wednesday, while Thursday should be a bit drier. Unseasonably cool for most of the week before a warmup starts on Friday. Increasing clouds into the weekend as another storm system moves in and thunderstorm chances return.

Day One: Monday, July 27th, 2026

Partly sunny with a slight breeze. Mostly cloudy overnight, then clear.

High: 66°

Low: 46°F 

Day Two: Tuesday, July 28th, 2026

Sunny during the day with a chance of showers overnight.

High: 66°

Low: 47°

Day Three: Wednesday, July 29th, 2026

A chance for rain during the day and night. Otherwise, mostly cloudy.

High: 61°

Low: 45°

Day Four: Thursday, July 30th, 2026

Mostly clear skies dominate the entire day.

High: 61°F 

Low: 44°F

Day Five: Friday, July 31st, 2026

Mostly sunny, then becoming partly cloudy overnight.

High: 70°F

Low: 55°F

Last Updated on June 25, 2026 at 2:36 pm