Boston, Mass – An early-season chill is set to grip the East Coast next week, with overnight lows dropping into the 40s from Massachusetts to Maryland and frost possible in inland valleys. The unusual cold snap is expected to settle in Monday and linger through September 13, impacting millions across the New England to Mid-Atlantic corridor.
According to the National Weather Service, a strong upper-level trough will anchor over the eastern U.S., locking in below-normal temperatures across interior New England, the Hudson Valley, central Pennsylvania, and much of the I-95 corridor. Cities like Springfield, Hartford, Allentown, and Frederick may all dip well into the 40s by midweek—conditions more typical of late October.
The risk for patchy frost will increase in higher elevations and rural zones across western Massachusetts, upstate New York, and parts of central Pennsylvania, especially between Tuesday and Friday. Sensitive vegetation should be protected, and those heading out early should be prepared for a crisp start.
While daytime highs will stay seasonable in the 60s and low 70s, the abrupt nighttime drop could catch some off guard, particularly those in homes without heat running yet. Weather agencies advise monitoring local alerts and preparing for rapidly cooling evenings.
Cooler-than-average conditions are expected to persist across the region into next weekend, with additional advisories possible.
