The Philadelphia area will get cooler, drier conditions than average during September and October, according to The Old Farmer’s Almanac fall 2026 forecast. Temps will run about 1 degree below what’s typical. Rainfall is expected to be roughly 1 inch less than usual across these two months.
This forecast marks a shift from what’s expected across much of the nation’s interior. Those areas will see warmer-than-average temps. Philadelphia’s region will transition out of summer heat and humidity fast.
Cooler, drier days could bring earlier leaf color changes than usual. Heavy rain and wind won’t be around much, so leaves may cling to trees longer once they shift colors.
Residents should prepare for chilly early-morning commutes sooner than in typical years. You’ll need jackets, scarves, and sweaters earlier in the season because temps will drop below average.
Less precipitation also creates good conditions for outdoor activities like apple picking, pumpkin patches, and hikes. Fewer weather-related cancellations will happen, and trails won’t be as muddy.
The Old Farmer’s Almanac released its official predictions for autumn 2026 on August 19. The publication provides seasonal weather outlooks for regions across the country.
September brings average high temps in the mid-70s to low 80s for the area. October sees highs in the 60s. A 1-degree drop may seem small, but you’ll notice the difference in comfort.
Less rain combined with cooler air will help those planning outdoor festivals and events. Organizers can expect more stable weather patterns throughout the fall months. The forecast period covers months when the region transitions from summer to winter. Autumn precipitation totals vary but average around 3 to 4 inches per month for the area.