CWS Forecast: Northwest Pennsylvania

Wednesday will be somewhat unsettled across mainly western Pennsylvania as showers and storms are expected from the afternoon into the overnight hours, with widely scattered severe possible to the northwest. Elsewhere, expect mostly sunny to partly cloudy skies with warm and muggy conditions. By Thursday, drier air filters into northern areas, while southern regions remain humid with showers and storms. Fortunately, drier air moves in for virtually everyone on Friday, with a sunny, warm day expected. Moving on, warm and humid air looks to make its way back north across the state on Saturday, with shower and storm chances apparent for both days this weekend. While a brief respite from the most humid conditions is possible on Monday, muggy and uncomfortable conditions appear likely most days through the middle of next week.

Day One: Wednesday, September 9th 2026

Showers, with a chance of thunderstorms.

  High: 80°F

Low: 66°F

Day Two: Thursday, September 10th 2026

Showers and storms, with clearing expected overnight. Temperatures drop overnight.

High: 72°F

Low: 60°F ↓

Day Three: Friday, September 11th 2026

Clear skies and calm conditions for both the day and night hours.

High: 71°F

Low: 63°F 

Day Four: Saturday, September 12th 2026

Cloudy, with a chance of rain.

High: 79°F

Low: 70°F 

Day Five: Sunday, September 13th 2026

Sunny skies.

High: 82°F

Low: 70°F

Last Updated on September 9, 2026 at 10:11 am