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Dave Epstein

Heat and humidity are back, but will break for ideal summer day Thursday

Toni Alexander, of Franklin, took in the scene while visiting Nantasket Beach with her family in Hull on June 18.
Toni Alexander, of Franklin, took in the scene while visiting Nantasket Beach with her family in Hull on June 18.Craig F. Walker/Globe Staff

Yesterday marine air kept all of our local towns from reaching 90 degrees. Boston stayed in the lower 70s with areas north and west of Route 128 jumping into the 80s. Western Massachusetts and Connecticut reached the 90s again.

This shallow layer of cooler ocean air rotated in over the top of a storm system out in the ocean on Sunday and will be pushed out to sea during the day Tuesday leaving us with a return to heat and humidity.

A small ocean storm helped bring cooler temperatures to the coastline Monday.  Notice the big storms over Texas Tuesday morning.
A small ocean storm helped bring cooler temperatures to the coastline Monday. Notice the big storms over Texas Tuesday morning.COD Weather

Tuesday, several towns in Western Essex and Northern Middlesex county in the Merrimack Valley will likely reach 90 in the afternoon for the fifth day out of the past six. A side note, the heat wave there, however, is officially over because we broke the string yesterday.

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This afternoon, the rest of us will be well into the 80s along with moderate levels of humidity, certainly a summer feel to the day.

A cold front will sweep through the area tomorrow. Well, this is officially a cold front but it’s more like a dew point front. On the Eastern side we are experiencing the high humidity; behind the front it still is warm but the air mass is not as moist.

A line of showers and perhaps thunderstorms will develop along the front tomorrow pushing through the region and also keeping more cloudiness around. Rainfall will not be widespread but if you do get a shower there could be some heavy downpours.

A cold front brings the chance of showers and a few thunderstorms on Wednesday afternoon.
A cold front brings the chance of showers and a few thunderstorms on Wednesday afternoon.COD Weather

Wednesday’s situation is not favorable for a well-organized area of rain and this means those of you that have not seen any showers for a couple of weeks might miss these as well. The best chance for showers is going to be between about 4 p.m. and 8 p.m., yet there could be a couple of scattered showers before that.

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The humidity we’ve been dealing with the past week will peak tomorrow. Dew points will reach the upper 60s to low 70s Wednesday before the showers. Late tomorrow night, a new air mass will arrive setting us up for a really nice beach day on Thursday. You can expect temperatures in the mid-80s along with an abundance of sunshine and light winds, truly an ideal summer day.

Friday and the weekend still feature warm and tolerable levels of humidity. There might be some pop up showers over the weekend in spite of a mainly sunny forecast. I certainly wouldn’t cancel any plans, just know that there is this chance over the weekend.

Beyond that, our biggest issue remains the lack of rain. Boston is now over five inches of rain below average for the year. The only “wet” month was April. Put another way, we’re missing a month and a half of rain.

July’s long range outlook continues the heat. The chances of next month being warmer than average across the country are high, and guess which region has one of the higher chances of a hot month. Beach, anyone?