PITTSBURGH, Pa. – Drivers across western Pennsylvania may need extra caution early Thursday as patchy fog rolls into the region before sunrise, creating reduced visibility on major roadways like I-376 and I-79 during the morning commute. The conditions arrive as communities prepare for Patriot Day events, with clear skies expected later for outdoor memorials and gatherings.
According to the National Weather Service in Pittsburgh, fog will develop between 2 a.m. and 9 a.m. Thursday, followed by sunshine and highs near 81 degrees. The fog could cause travel delays on local highways, so PennDOT advises allowing extra time and using low-beam headlights. Light winds from the north are expected by afternoon, helping clear conditions in time for late-morning observances.
Thursday night brings mostly clear skies with temperatures dropping into the low 50s. On Friday, patchy morning fog returns but will give way to sunshine and a high of 83. By the weekend, dry and warm conditions dominate, with Saturday’s high near 84. Sunday and Monday continue the stretch of mostly sunny skies, keeping temperatures steady in the low 80s—ideal for outdoor events or travel.
Residents should remain cautious during early morning hours when fog is thickest, especially in valleys and near rivers. Plan extra travel time if heading into Pittsburgh for Patriot Day ceremonies, and stay aware of changing conditions on bridges and interchanges where fog tends to linger.
The quiet stretch of late-summer weather offers a reminder to prepare for shifting fall patterns. Morning fog is likely to remain a common feature in western Pennsylvania as cooler nights meet lingering warmth during September.
Five-Day Forecast for Pittsburgh, PA
- Thursday: Fog early, then sunny. High 81. Low 53.
- Friday: Morning fog, then sunny. High 83. Low 55.
- Saturday: Sunny, warm. High 84. Low 60.
- Sunday: Mostly sunny. High 83. Low 58.
- Monday: Mostly sunny. High 82. Low 57.
