Cooler temperatures, persistent northeast winds and increasing clouds will dominate much of the Northeast through the middle of the week, while a developing weather system threatens heavier rain, strong winds and rough marine conditions farther south.
Boston will see patchy fog early Monday before skies become partly sunny with a high near 67. Clouds increase Monday night as temperatures fall to around 51, followed by gradual clearing Tuesday and a high near 62. Wednesday will be partly sunny and breezier, with a high near 63 and northeast winds gusting as high as 28 mph.
Worcester will also reach about 67 Monday after morning fog, with temperatures dropping to around 48 overnight. Tuesday will begin cloudy before becoming mostly sunny with a high near 62, while Wednesday brings partly sunny skies, a high near 63 and gusts as high as 26 mph.
Springfield and Hartford will be slightly warmer Monday, with highs near 69 following areas of morning fog. Both cities cool into the middle 60s Tuesday and Wednesday, with northeast winds becoming stronger Wednesday and gusts reaching around 25 mph.
Bridgeport will reach about 71 Monday as cloudy skies gradually give way to more sunshine. Temperatures fall into the mid-60s Tuesday and Wednesday, with persistent northeast winds and gusts as high as 28 mph Wednesday.
Providence will see a slight chance of an early shower Monday before gradual clearing and a high near 66. Tuesday will reach around 63, followed by a partly sunny Wednesday with a high near 64 and northeast wind gusts as high as 26 mph.
Conditions will be quieter across much of northern New England.
Portland, Maine, will be mostly sunny Monday with a high near 63 before temperatures fall to around 50 overnight. Mostly sunny conditions continue Tuesday, and Wednesday will be sunny with a high near 59 and east winds gusting as high as 25 mph.
Belfast, Maine, will remain mostly sunny Monday and Tuesday with highs of 65 and 62. Wednesday will be sunny with a high near 64, while overnight temperatures remain in the lower 40s.
Berlin, New Hampshire, faces the coldest overnight temperatures in the region. Monday will be partly sunny with a high near 61, but temperatures fall to around 34 overnight with patchy frost developing after 3 a.m. More frost is possible early Tuesday and Wednesday as nighttime temperatures fall into the lower and middle 30s.
Manchester, New Hampshire, will gradually become mostly sunny Monday with a high near 68. Mostly sunny skies continue Tuesday and Wednesday, with highs in the lower to middle 60s.
Burlington, Vermont, will be mostly cloudy Monday with a high near 60 before sunshine takes over Tuesday and Wednesday. Tuesday reaches about 64, while Wednesday warms to around 68.
Conditions become more unsettled farther south.
New York City will reach about 72 Monday as clouds gradually give way to partial sunshine, but rain chances increase overnight. Rain is possible Tuesday, mainly before 2 p.m., with a high near 65. Wednesday will remain mostly cloudy and breezy with a high near 63 and northeast winds gusting as high as 30 mph.
Newark, New Jersey, follows a similar pattern, reaching about 72 Monday before rain becomes possible after 2 a.m. Tuesday brings another chance of rain and a high near 65. Northeast winds strengthen Wednesday, with gusts as high as 30 mph.
Philadelphia faces a wetter forecast. Monday will be partly sunny with a high near 72, but showers become likely after 2 a.m. Tuesday. Rain remains likely Tuesday with a high near 64, and additional showers are possible Tuesday night into Wednesday.
Albany, New York, will largely avoid the wetter conditions. Monday will gradually become mostly sunny with a high near 64, followed by a mostly cloudy Tuesday with a high near 65. Wednesday will be mostly sunny and slightly warmer, reaching about 67.
The broader weather pattern is being driven by an upper-level trough and frontal system moving across the central United States toward the Ohio Valley and Mid-Atlantic. Periods of showers and thunderstorms are expected along the boundary, with multiple rounds of moderate to locally heavy rainfall threatening portions of the Appalachians and Mid-Atlantic.
Excessive rainfall and flash flooding are concerns in portions of those regions Monday, while severe thunderstorms are also possible from parts of the Appalachians into the Southeast. Additional showers and thunderstorms are expected Tuesday as another disturbance moves across the Ohio Valley and Mid-Atlantic.
A moist tropical air mass will continue to produce daily showers and thunderstorms across portions of Florida, particularly southern Florida, with locally heavy downpours creating additional flooding concerns through Tuesday.
Farther west, Gulf and Pacific moisture will increase showers and thunderstorms across parts of the southern Plains, Southwest and Four Corners. Locally heavy rainfall could produce flash flooding across New Mexico and portions of western Texas through Tuesday.
Behind the advancing frontal system, cooler air will continue spreading across the north-central and eastern United States, with many areas seeing daytime highs in the 60s. The Southeast and southern Plains will remain considerably warmer and more humid, with highs generally in the 80s and 90s.
Conditions could become particularly hazardous offshore.
A cold front moving south and southeast across the northern and central Mid-Atlantic waters is expected to stall near the Virginia Capes as low pressure develops south of the boundary. That low-pressure system is expected to strengthen and move slowly north and northeast through the second half of the week.
Strong high pressure building north of the region will interact with the front and developing low pressure, potentially generating strong northeast to east gales and building seas from Tuesday through Friday night, particularly across the central and northern waters.
Potential storm-force winds are also possible as the system develops. Significant marine conditions could affect much of the region from Tuesday through Thursday night, creating increasingly dangerous conditions for mariners.