Metro Boston, North Shore and Metro West: The weekend did not bring as much rain as expected, actually it was almost non existent on Sunday, as the steadier rainfall stayed well southeast of Boston both days. Cool temperatures prevailed, especially closer to the coast, as winds stayed on shore through the weekend.
A stalled frontal boundary remains offshore this morning and is expected to begin shifting eastward later in the day. The low clouds and any patchy fog burns off this morning with partial sunshine for the afternoon hours. There is a threat for a pop up shower or thunderstorm in the afternoon, any one of which could produce locally heavy downpours. The threat lessens along the coastal plain. Temperatures climb into the low 80s inland, possibly a few spot mid 80s, but a touch cooler on the shore as readings stay in the mid to upper 70s. Winds stay light, turning onshore along the coast in the afternoon.
An evening shower or storm is possible, especially away from the coast, otherwise skies remain mostly to partly cloudy overnight Monday with areas of patchy fog redeveloping. Lows in the low to mid 60s. Winds near calm.
On Tuesday we have a disturbance in the upper levels approaching from our west. There is also a cold front that will approach and move through on Wednesday. The combination of the upper level disturbance, followed by the cold front, means a period of unsettled weather is likely later Tuesday into Wednesday.
Tuesday, early fog patches burn off and skies turn partly sunny. However, in the afternoon there is a chance of showers and thunderstorms developing. It will become more humid as well. Highs once again from the upper 70s to low and mid 80s, coolest on the shore. Light northwest winds may lend themselves to turning onshore in the afternoon, keeping it cooler along the beaches.
An evening shower or storm is possible into Tuesday evening with skies remaining mostly to partly cloudy through the overnight. Lows in the 60s. Winds near calm after sunset.
Wednesday, the cold front approaches and with it showers and thunderstorms are likely. Meanwhile, Tropical Storm Bertha moves well southeast of New England. Highs approach 80 degrees. These showers and storms subside during the evening, although a rogue shower cannot be ruled out overnight. Lows in the low to mid 60s.
The cold front may get hung up along the coast early on Thursday and slow to move offshore. If this occurs we could see clouds and a spot shower early in the day, followed by partly sunny skies. However, a shower or storm is possible in a few locations in the afternoon and early evening. Highs nudge 80 degrees.
Skies begin to partially clear Thursday night. Lows near 60.
Friday may very well be the pick of the week. High pressure will expand eastward on the backside of the departing cold front and it should be a delightful day with drier air working in. Sunny skies, highs in the low 80s inland, but cooler on the shore.
North Shore beach outlook:
Monday: Low clouds and fog burn off early, followed by partly sunny skies. A slight chance of an afternoon shower or thunderstorm from Cape Ann northward. High temperatures mid to upper 70s. Light and variable winds, becoming east to southeast at less than 10 mph in the afternoon. UV Index moderate to high. Surf 1 to 2 feet. High tide in the evening, means low tide at midday.