Pittsburgh and surrounding areas are set to enjoy a stretch of calm and pleasant late-summer weather this week, though commuters should be prepared for patchy fog in the early hours. According to the National Weather Service in Pittsburgh, fog will develop Tuesday morning across western Pennsylvania, particularly along I-376, the river valleys, and rural roadways in Allegheny, Beaver, and Washington counties. The fog could reduce visibility until about 9 a.m., when sunshine begins to break through. Motorists are advised to drive with headlights on low beam, reduce speed, and allow extra travel time, especially near bridges and interchanges where conditions may be worse.
Once the morning haze lifts, Tuesday will bring abundant sunshine with temperatures rising to around 78 degrees. Light east winds will gradually shift southeast during the afternoon, creating a comfortable day. The pattern will hold into midweek, setting the stage for warmer afternoons that feel more like the lingering days of summer than the early weeks of fall.
By Wednesday, skies will remain clear and bright, with highs climbing to near 80 degrees and overnight lows dipping close to 50. On Thursday, another round of morning fog may briefly slow the commute before afternoon sunshine pushes highs to about 82 degrees. The warming trend continues Friday and Saturday, with highs reaching the lower to mid-80s and evenings remaining cool in the 50s. This mix of cool nights and sunny afternoons offers an inviting stretch of weather ideal for outdoor activities, whether it be enjoying the city’s riverside trails, attending late-season sports events, or simply relaxing in the sun.
While the warmth lingers, forecasters emphasize that fog remains the only potential travel concern during this period. The Pennsylvania Department of Transportation encourages drivers, especially young and inexperienced motorists heading to school, to adapt their speed and remain alert in reduced visibility conditions. The reminder comes as seasonal shifts in temperature often create favorable conditions for valley fog, particularly in the early mornings near bodies of water.
The broader forecast offers little sign of rain through the weekend, providing residents and visitors with uninterrupted sunshine. Saturday will bring slightly more clouds, though dry conditions will persist, leaving plenty of time for late summer gatherings and outdoor plans. Even as nights remain crisp, daytime warmth will continue to push into the 80s, marking one of the last warm spells before autumn’s cooler air becomes more consistent.
With no rain in sight and only morning fog as a challenge, the week ahead promises to be one of the most enjoyable stretches in recent weeks. Pittsburghers are encouraged to take advantage of the summerlike afternoons, while planning a little extra time for the commute each morning. This balance of cool mornings and warm afternoons highlights the transitional charm of September in western Pennsylvania, when foggy sunrises give way to golden afternoons under clear skies.
Five-Day Forecast for Pittsburgh, PA
Tuesday: Morning fog, then sunny. High 78. Low 49.
Wednesday: Sunny. High 80. Low 50.
Thursday: Morning fog, then sunny. High 82. Low 54.
Friday: Sunny. High 82. Low 54.
Saturday: Partly cloudy. High 84. Low 58.
