DAYS 1-5 (MAY 26-30)

As we move to the middle day of the holiday weekend, we observe early this morning some showers and even an isolated thunderstorm having moved across southern New England, now (as of 8:30 a.m. writing) exiting the MA South Shore, with a few lighter showers near the South Coast. Aside from a quick pop-up shower potential in the mid to late morning as a weak boundary settles through this area, a good part of today will be rain-free. But later today, with a disturbance about, a little more moisture, and some solar heating, and the weak surface boundary lifting back to the north, we can and probably will see the development of some pop up showers and thunderstorms by later afternoon to early evening. These don’t look widespread, rather scattered, but can be heavy, at least briefly, where they occur. While this is going on we’ll have a more notable air flow off the Atlantic and this should keep the lower levels stable enough so that development is far less likely east of I-95. As we move through tonight and Monday, clouds will be the rule as we are in a southeasterly to southerly air flow as low pressure moving into the Great Lakes sends a warm front into and across the region. While occasional showers can accompany this, I do not expect a widespread day-long rain, and many of the outdoor activities for Memorial Day will take place with mainly rain-free conditions. At the end of the day and especially at night, a more pronounced and widespread band of showers and embedded thunderstorms will arrive from west to east with a slow-moving cold front, which will take until Tuesday morning to clear through the area. Some significant rainfall is likely with this, but this will followed by drying and not much cool air behind the front, resulting in Tuesday becoming quite a nice late spring day. Heading into midweek, we have a trough back to the northwest associated with the Great Lakes low pressure area that will swing through with another episode of shower chances from late Wednesday into Thursday. Timing and details of this part of the forecast need to be tweaked and fine-tuned the next few days.

TODAY: Variably cloudy. An additional shower possible east of I-95 and south of I-90 into mid morning. Isolated to scattered showers and a slight chance of a thunderstorms mainly I-90 northward later in the afternoon. Highs 68-75 coast, 75-82 inland, but coastal areas will cool down during the afternoon. Wind S to SE up to 10 MPH.

TONIGHT: Mostly cloudy. Fog patches South Coast. Lows 55-62. Wind SE up to 10 MPH.

MONDAY (MEMORIAL DAY): Mostly cloudy. Isolated to scattered showers. Rain-free most of the time. Highs 65-72, coolest South Coast / Cape Cod. Wind SE to S 5-15 MPH.

MONDAY NIGHT: Mostly cloudy. Showers likely. Chance of thunderstorms. Lows 55-62. Wind S to SW 5-15 MPH.

TUESDAY: Beginning-of-day clouds with showers and thunderstorms exiting west to east, then a sun/cloud mix. Highs 75-82. Wind SW 5-15 MPH.

TUESDAY NIGHT: Clearing. Lows 52-59. Wind W 5-15 MPH.

WEDNESDAY: Sunny start, then a sun/cloud mix. Highs 66-73. Wind NW 5-15 MPH.

WEDNESDAY NIGHT / THURSDAY: Variably cloudy. Chance of showers. Lows 52-59. Highs 64-71. Wind S to W 5-15 MPH.

DAYS 6-10 (MAY 31 – JUNE 4)

This stretch from the final day of May into the first few days of June looks mainly dry with high pressure in general control. A trough approaching around June 2 may be obliterated by the block or deflected to the south. Early hints of some unsettled weather around the end of the period though. Temperatures near to below normal.

DAYS 11-15 (JUNE 5-9)

Pattern looking a little unsettled early to middle portion of this period before fair weather returns. Far too soon for any details. Temperatures variable, averaging fairly close to normal.