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Boston weather: Warm and humid Wednesday, showers and storms by Thursday

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Metro Boston, North Shore and Metro West: The high pressure system that has given us several days of beautiful weather has moved far offshore. This will continue to promote a south to southwest air flow pushing more humid, tropical like air into the region ahead of a slow moving cold front. Low pressure moves across northern New England during Wednesday.

Expect another warm day on Wednesday but with much higher humidity. Although the day may start out with patchy fog and clouds it will become a partly sunny day overall. There is a slight chance of an afternoon shower, only about 30%, across the interior and Merrimack Valley. Temperatures once again climb into the 80s but it will feel warmer because of the increasing humidity levels through the day. Highs should generally be from 82 to 86 degrees. Southwest winds 10 to 20 mph.

Low pressure emerges out of the Ohio Valley and eastern Great Lakes Wednesday night and Thursday with the disturbance crossing New England during Thursday. This brings cloudiness and a threat of showers Wednesday night with a chance of a thunderstorm as well. Locally heavy downpours are possible later at night. It stays humid right through Thursday. Lows on Wednesday night stay near 70 degrees and coupled with the humidity it will be an uncomfortable night for sleeping without the air conditioner. South to southwest winds 5 to 15 mph.

We mentioned earlier in the week that Thursday could be an unsettled day because there were indications the associated cold front would be slow to approach and move across eastern Massachusetts. The low pressure disturbance moves offshore Thursday night with the trailing cold front moving through as well. Expect a day of numerous showers and thunderstorms on Thursday, muggy and warm with highs near 80. A thunderstorm or two that brings heavy rain and gusty winds cannot be ruled out. Any of the heavy rain may produce flooding of streets and low lying areas. During the overnight the wet weather will subside as the cold front eases offshore. Not as warm Thursday night as lows fall into the low to mid 60s. Winds backing to the northwest and north.

With the cold front offshore another shot of pleasant weather arrives Friday and remains in place through the weekend. Humidity levels drop as we return to similar weather we had last weekend. Fair skies with a mix of clouds and sun both Friday and Saturday as Canadian high pressure moves in and should be overhead Saturday. Highs in the mid 70s coast to low 80s inland, overnight lows in the upper 50s to low 60s.

High pressure moves offshore Sunday keeping it pleasant through the area. Temperatures climb into the low 80s, although it may remain a touch cooler at the beaches. Sunny skies prevail with a few clouds from time to time.

Dry and mild conditions look to remain in place early next week with our stretch of generally pleasant weather continuing as we close out the month. Increasing humidity levels will once again creep in along with temperatures climbing back into the 80s.

Wednesday’s North Shore beach outlook:

Early morning clouds and fog lift to a partly sunny sky. Slight chance of an afternoon shower north of Cape Ann. High temperatures in the low 80s. Brisk southwest winds 12 to 22 mph. High tides late morning. Water temperatures around 60 degrees. UV Index very high at 9.

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