Metro Boston, North Shore and western suburbs: A cold front pushed through overnight and continues to move offshore early today. A large ridge of high pressure, centered across the mid-Atlantic, will dominate our weather through the early portion of this week.
Today, skies have cleared out nicely and it is another beautiful morning across the area. Gusty west to northwest winds will usher in cooler air with a mostly sunny sky overhead and high temperatures in the low 60s this afternoon. Winds begin to diminish through the mid and late afternoon and by tonight they will drop off to near calm. With clear skies above it will be a good night for radiational cooling, which means temperatures are going to fall quickly, probably bottoming out in the mid 30s inland to around 40 degrees on the coast.
With the high in control we can look forward to another exceptional Autumn day on Monday, with plenty of sunshine, lighter winds and high temperatures returning to the low 60s. With a southwest wind in place it will not be so chilly Monday night as lows fall into the 40s under a mostly clear sky.
Tuesday, another in a series of cold fronts approaches. This front will be the one that dramatically changes our temperatures and weather pattern beginning Wednesday. Ahead of the front we can expect a partly cloudy sky, becoming mostly cloudy by late in the day and overnight as the front slides through the area. Chance of a few scattered showers late day and early evening, otherwise the front moves through dry. Highs once again crest in the low 60s, then overnight lows becoming quite chilly as the mercury falls into the mid and upper 30s behind the front. Winds will gust out of the southwest ahead of the front, perhaps reaching 25 mph during the afternoon.
Once the front clears the coast and slides offshore it will slow as a low pressure system develops along the front to our south. Meanwhile, colder air will pour into the area and skies remain mostly cloudy through the overnight. This part of the forecast hinges on what the low to our south does. Where it tracks and how much and quickly it deepens as it makes its pass over the open waters to our southeast and east. Having said that it appears at this time the storm will track close enough to keep the clouds in here with a period of showers or steadier rain later Wednesday into Wednesday night. Much below normal temperatures with highs only in the low to mid 50s, upper 30s at night. With enough cold air in place it is possible that areas just to our north and west see some flakes toward the end of the storm as the system pulls away.
Thursday and Thursday night, the storm pulls away into the Maritimes and skies become partly cloudy. Still a chance of an afternoon sprinkle. Cold and windy with highs only near 50 degrees. Overnight lows in the low to mid 30s inland to upper 30s on the coast.
Temperatures so far for the month have averaged 4.7 degrees above normal in Boston. That number will take a big hit downward during the late week period into next weekend as we may flirt with near record low maximum high temperatures Friday and Saturday. Needless to say the first two World Series games in Boston will be played in blustery conditions, with the possibility of some rain during game one, depending on the track of the coastal low.