Philadelphia, Pa. – Sunshine dominates this Labor Day weekend, but a sharp cool down will mark the start of September across Pennsylvania. Drivers and holiday travelers along I-95 will see dry roads and clear skies through Monday, but the first taste of fall arrives quickly after.
According to the National Weather Service, highs will climb near 80 degrees in Philadelphia through Labor Day before cooler Canadian air drops south. By Tuesday night, parts of Pennsylvania could dip into the 50s, with even cooler air settling deeper into the Ohio Valley and Midwest.
Locally, Philadelphia stays mostly sunny and warm through Monday, offering near-perfect conditions for outdoor gatherings and late-summer barbecues. Travelers heading west toward Harrisburg or north to the Poconos will also see clear skies, though nighttime lows will begin to slide downward.
That shift becomes more noticeable midweek. The NOAA 6–10 day outlook shows a strong probability for below-normal temperatures across the Northeast, with lows in the 40s possible in higher elevations of central and northern Pennsylvania. Morning commutes could feel more like mid-October than early September, a jolt for those still clinging to summer.
Residents are encouraged to plan ahead by layering clothing for early mornings, checking heating systems, and watching for shifting weather alerts. While no major storms are forecast, a few showers may develop by Thursday and Friday as the cool air settles.
The cooler spell is expected to last several days, reminding Pennsylvania that fall is around the corner. Updates will continue as September weather patterns sharpen.
Five Day Forecast for Philadelphia, Pa.:
- Sunday: Sunny, high 79, low 58.
- Labor Day Monday: Mostly sunny, high 80, low 58.
- Tuesday: Sunny, high 80, low 58.
- Wednesday: Mostly sunny, high 80, low 60.
- Thursday: Chance of showers, high 79, low 61.
