Philadelphia, PA – The first half of August has felt more like early fall for much of the Mid-Atlantic, with persistent onshore winds keeping daytime highs muted and nights cool. According to the National Weather Service in Mount Holly, coastal areas are experiencing their coolest first two weeks of August in roughly 30 to 35 years.
Atlantic City Airport and Georgetown, Delaware, are running nearly 5 degrees below average so far this month. Atlantic City Marina didn’t even crack 80 degrees until Tuesday, an unusually late milestone for mid-August.
Inland locations like Allentown and Philadelphia have also trended cooler, with mean temperatures 2–3 degrees below normal. Mount Pocono has seen a mean of just 66.5°F, while coastal spots such as Atlantic City have averaged in the low 70s. The last time this stretch of cool weather occurred so early in August was in the 1980s and ’90s for some areas.
The cooler pattern has meant reduced air conditioning demand, but beachgoers have faced brisk mornings and sweater-worthy evenings. The NWS says the trend could shift with warmer air pushing in next week.
