Everything is transient, and so too is the weather, and we are about to undergo some changes back to the hot weather this week.
High pressure will dominate over the next several days, bringing us sunny skies, but as the high pushes out to the Atlantic, the return flow of southwest air will bring not only more heat but more humidity. We have one more really comfortable day on Monday with temperatures in the 80s inland and inching toward 90 for Boston.
Dew points will reach the mid- to upper 60s Tuesday and continue into early Wednesday, pushing the heat index up to around 100. The good news is the high humidity should back off late Wednesday and toward the end of the week.
A Heat Advisory is in effect for most of New England Tuesday morning into Wednesday night.
Heat waves are defined as three consecutive days of at least 90-degree weather, so if we’re going to see a heat wave this week, it’s likely going to happen Tuesday through Thursday. Not every community will see an official heat wave, but all areas are going to be quite warm. If you’re on vacation this week, as long as you’re OK with the heat, it’ll be fantastic. And if you’ve rented a spot on a lake or any other body of water, you’ll be happy that you chose it.
There may be some backing off of temperatures at the end of the week. We’ve already reached 100 degrees twice this year, and there’s only one year that’s gone beyond that: 1911, when there were four 100-degree days in July! We likely won’t reach 100 this week, although a few inland areas could get close.
Thunderstorm chances in Northern New England
There is a chance for a severe thunderstorm or two across Northern New England Tuesday night.
Nighttime temps
It’s been comfortable for sleeping the past couple of nights, but that’s also going to change this week, with temperatures staying in the 60s Monday night and 70s Tuesday and likely Wednesday nights as well.
Although we did see some rain earlier this month, we still need it, and with sunny, dry weather predicted for the entire week, you’re definitely going to need to water containers and other plants as towns allow.
Monday-Tuesday breakdown
Greater Boston: Look for sunshine Monday and Tuesday with temperatures Monday in the 80s and into the 90s on Tuesday.
Central/Western Mass.: Plenty of sunshine will start the work week with temperatures in the 80s Monday and rising to the mid-90s on Tuesday, with humidity making it feel near 100.
Southeastern Mass.: It’s dry and sunny Monday and Tuesday, with temperatures in the 80s on Monday, and 80s at the coast but 90s away from the water on Tuesday.
Cape Cod and the Islands: Temperatures will reach the lower 80s on Monday and mid-80s on Tuesday. Both days feature plenty of sunshine
Rhode Island: All sunshine covers the region Monday and Tuesday, with temperatures in the lower 80s on Monday, and 80s over South County, but 90s inland on Tuesday.
New Hampshire: With sunshine, temperatures will get into the mid-80s on Monday and then rebound into the 90s on Tuesday.
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Ken Mahan can be reached at ken.mahan@globe.com. Follow him on Instagram @kenmahantheweatherman.