The focus of this post will be on the weather forecast for the Labor Day Weekend (Saturday & Sunday August 30 & 31 as well as Monday September 1). But of course there will be a look further into the first week of September.
Overall pattern is warm, though a cooler air mass is currently over the region and will hang in place through Saturday morning before warmer air arrives from the southwest. Saturday itself will dawn quite chilly by standards of the end of August. But high pressure will be in the process of sinking to the south of New England while a weak warm front slides through, producing only some high cloudiness. But it will take quite a while for humidity to start increasing, so after the chilly start you will notice it warming up somewhat on Saturday but remaining dry. By Saturday night and especially Sunday, we’ll get into a stronger southwesterly flow of warm to very warm, more humid air. At the same time, a cold front will be approaching from the northwest and will get closer by Sunday night. At this time it looks like shower and thunderstorm activity with this front will hang back well northwest of the Boston area over western MA and CT, VT and western to central NH and into parts of Maine by late in the day into the evening. In the overnight hours of Sunday night / early Monday this activity will press to the east and cross the main WHW forecast area. Most of it should be moving offshore by early Monday as the front does the same. However the front will be weakening and there is no big push of dry air behind it for Labor Day, which will still be somewhat muggy with a pop up shower or storm possible anywhere in the afternoon but favoring southern MA and RI. So all in all, the weekend will be quite decent.
Looking ahead, we will remain under a flat ridge of upper level high pressure while the jet stream tries to send a couple fronts across the Upper Midwest, Great Lakes, and Northeast Tuesday-Friday. None of these fronts look particularly strong.
FORECAST FOR SOUTHEASTERN NEW ENGLAND…
TONIGHT: Mostly clear to partly cloudy with some high clouds coming in from the NW. Lows 45-50 inland valleys, 50s elsewhere. Wind light variable.
SATURDAY: Partly cloudy to mostly sunny with some additional high clouds at times. Highs 75-82, coolest coast. Wind light SE to S.
SATURDAY NIGHT: Variable high clouds. Increasingly humid. Lows in the 60s. Wind SW 5-15 MPH.
SUNDAY: Variable clouds at all levels but mainly high & mid level allowing episodes of sun. Humid. Highs 75-80 South Coast / Cap;e Cod, 80s elsewhere, may touch 90 inland. Wind SW 10-20 MPH with higher gusts.
SUNDAY NIGHT: Mostly cloudy. Scattered to general showers and thunderstorms moving across the region from west to east mainly overnight. Humid. Lows 65-70. Wind SW 5-15 MPH but with higher gusts.
MONDAY – LABOR DAY: Variably cloudy. Lingering showers Cape Cod early. Isolated to scattered afternoon showers or thunderstorms possible afternoon, especially along and south of the Mass Pike. Humid. Highs 77-86, coolest Cape Cod. Wind W 5-15 MPH.
TUESDAY: Variably cloudy. Scattered showers/thunderstorms possible mainly at night. Low 65. High 82.
WEDNESDAY: Partly cloudy. Low 66. High 85.
THURSDAY: Partly cloudy. Low 67. High 88.
FRIDAY: Partly sunny. Low 66. High 85.