Friday - A dry day overall, a few clouds that are seen over NH and VT may work their way into the Boston area by mid afternoon. A spot, but light shower could be possible especially between 2 and 5 pm today in some locations inland. A sea breeze will develop at the coast keeping temperatures in the upper 70s where inland areas reach the lower 80s. The sea breeze should also keep coastal areas in the clear for the day. You will notice the humidity levels increasing throughout the day.
Saturday - A dry day but becoming muggy by the evening hours. Coastal locations should once again stay cooler and it will be coolest on the Cape and South Shore as well. Highs in the upper 70s to lower 80s.
Sunday - The day looks to be good, but it will be very humid and warm. It will feel like it is in the upper 80s for most locations and it will be very sticky. The dewpoint will rise to around 70-74, which is known as a tropical air-mass. It will be oppressive!
A slow moving cold front approaches New England on Sunday evening. With such an airmass in place, the atmosphere is very moist and possible downburst type thunderstorms are possible across the region. What this means is that thunderstorms are capable of bringing very heavy rainfall and gust winds. Flash flooding is a concern with such storms, so please take caution if you are near a stream, creek or run off area.
Right now the timing is as follows:
 | |
| Timeline for the front edge of thunderstorms. |
- 2pm NH/CT River Valley
- 5pm Northshore MA - S NH
- 8pm Cape Ann to Plymouth
- 11pm Ptown - Cape Cod
I will update these time frames over the weekend to give you a better outlook, but you can prepare accordingly now if need be with any outdoor activities.
Monday - Slowly drying out throughout the day. More humid on the Southshore and Cape. Highs in the mid 80s most locations. Chance of an afternoon thunderstorm.
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