Thermometers crept up to the 90-degree-mark in Boston this morning as the city enters day five of this summer’s second heat wave.
The thermometer hit 90 degrees at Boston Logan International Airport at 10:37 a.m., making it official.
The last time that Massachusetts had five consecutive days of over-90 degree weather in July was 1990, according to meteorologist Charles Foley at the National Weather Service in Taunton.
But relief is expected soon.
“We don’t expect temperature exceeding 90 degrees Monday,†he said. “This should be the fifth and last day of the heat wave.â€
The temperature is expected to hover over 90 degrees today with a 30 percent chance of scattered showers during the afternoon, Foley said.
South Boston communities including Quincy, Taunton, and Brockton will feel the worst of the heat because of cloudless conditions, while ocean winds will keep the air cooler around Cape Cod and the islands, where temperatures willl likely stay in the high 70s.
Temperatures are expected to drop to the mid- to high 80s in the upcoming week, with a chance of showers and isolated thunderstorms each afternoon, according to Foley.
Because of the moist air mass that has traveled from the Gulf and settled over Greater Boston this past week, some of those showers may turn into downpours.
“That’s because air normally associated with Miami or New Orleans or Havana has settled up here in southern New England,†Foley said.
He added that the dewpoint, which is a measure of moisture in the air, will remain at 70 degrees as it has during the preceding days of the heat wave.
“A dewpoint of 70 is categorized as oppressive conditions,†Foley said. “There is a very humid air mass over us right now so even though blazing temperatures are expected to end, we’ll have bad humidity into next week.â€
Alyssa A. Botelho can be reached at alyssa.botelho@globe.com. Follow her on Twitter at @AlyssaABotelho.
