Metro Boston, North Shore and Metro West: The beginning of the work week, or vacation for some, starts off wet. Low pressure rides along the Pennsylvania and New York border today then across central New England tonight. Clouds prevail with showers likely and a few thunderstorms as well. Most of the activity likely through midday, then becoming intermittent in the afternoon. Watch for the possibility of a stray severe storm with heavy downpours, gusty winds and frequent lightning. Slight chance of a peek of afternoon sun. It remains humid with high temperatures near 80 degrees. South to southwest winds 5 to 15 mph.
The threat of showers begins to diminish Monday night as low pressure north of us swings a cold front through the area and offshore by Tuesday morning. The front will be a slow mover and then is expected to stall offshore by mid week. Lows Monday night in the upper 50s inland to low 60s on the coast. Gradually becoming less humid toward morning. Southwest to west winds 5 to 15 mph.
Tuesday, behind the departing front, skies improve and it should be a partly cloudy day on average. Less humid, highs mid 70s on the beach to a few low 80s inland. Light west winds, possibly turning onshore on the beaches.
Tuesday night will be mostly clear, cool and calm. Low temperatures in the mid and upper 50s, about 63 in Boston.
Showers will be a threat across New York State and also well offshore for most of the week. In between we should stay mainly dry but there is a slight chance of a shower on any given afternoon. Otherwise, generally partly cloudy skies through the work week. A word of caution, if the frontal boundary inches west a bit and a few disturbances ripple along the front this will mean more clouds than sun and a better chance of showers during the week. Highs from the mid 70s to low 80s, coolest near the coast. Overnight lows in the upper 50s to mid 60s, coolest inland.
North Shore beach outlook:
Monday: Showers and storms prevail, especially in the morning. Areas of fog in the morning. Otherwise a generally cloudy day, although a peek of sun cannot be ruled out in the afternoon. High temperatures in the mid 70s. South winds 8 to 18 mph. Water temperatures in the mid 60s. High tide just after midday. Surf 2 to 4 feet with a moderate chance of rip currents. UV Index moderate.