Metro Boston, North Shore and Metro West: Tuesday was a refreshing change from the weather of the previous few days given the atmosphere was much more stable, we encountered far less humidity and a pleasant day overall. Although clouds did build in during the afternoon and evening it did nothing to spoil the day. We can look forward to a similar type of day on Wednesday.
The morning weather map shows a stalled frontal boundary well offshore, with high pressure building into the mid-Atlantic Region. In the upper levels there is a large disturbance anchored north of the Great Lakes in southern Ontario.
Expect another sunny and cool start on Monday with clouds again building in for the afternoon and evening hours. High temperatures from the mid 70s to 80 degrees, coolest on the shore. Winds will be very light, becoming onshore along the coast in the afternoon. The clouds will slowly melt away after sunset with a mostly clear night to follow. Pleasant temperatures once again, lows from the mid 50s to 60 degrees, coolest across the interior. About 63 in Boston. Winds near calm.
Repeat performances are in order for both Thursday and Friday. Early sun, afternoon clouds with just a slight chance of an afternoon pop up shower across the interior sections during the afternoon and evening. You will also notice the humidity levels begin to increase by Friday as high pressure to our south moves offshore and creates a moist southerly flow into the region. Highs both days upper 70s coastal plain to low 80s inland. Southwest winds 5 to 10 mph, possibly turning onshore along the immediate coast.
Thursday night may feature an evening shower through the interior, otherwise partly cloudy skies on average. A touch milder with lows in the low to mid 60s.
By Friday night the offshore frontal boundary will have shifted westward with the possibility of a wave of low pressure moving along the front. The issue will be how far west the front retrogrades and how close any disturbance along the front comes. With that in mind it appears the weekend may see mostly cloudy skies with periods of showers. Highs in the 70s, overnight lows in the 60s. It will be a bit more humid as well.
North Shore beach outlook:
Wednesday: If you are heading to the beach today get out there early as clouds will roll in during the afternoon. Mostly sunny in the morning, partly to mostly cloudy by late in the day. High temperatures in the low 70s Cape Ann northward, mid 70s south of Cape Ann. Light variable winds turning onshore 5 to 10 mph. Water temperatures in the mid 60s. UV Index high. Surf 2 to 3 feet. High tide approaching mid afternoon.