David Epstein: ‘This could end up being one of the longest heat waves on record for some communities’

At times this weekend it may be so uncomfortable that it'll be difficult to really do anything outside, especially between 11 in the morning and 5 in the afternoon.

6/27/2014 - Chatham, MA - Sun revelers enjoy the beach in front of the Chatham Bars Inn.  For Address section feature on Cape Cod town of Chatham, MA. Item: 070614LocationPics.  Dina Rudick/Globe Staff
Sun revelers enjoy the beach in front of the Chatham Bars Inn. –Dina Rudick / The Boston Globe, File

We saw some much-needed rain across the entire area on Thursday, and that sets us up well in terms of moisture as we’re about to enter a very hot and dry spell.

For a heat wave to be official you need three days in a row that reach 90 degrees or better, and it’s likely that many communities just away from the shoreline are going to see at least that — and perhaps double it. This could end up being one of the longest heat waves on record for some communities.

The warm weather starts Friday, but it won’t be an exceedingly hot day, nor will it be exceedingly humid. Temperatures will reach the mid-to-upper 80s with a couple of spots touching 90.

Highs Friday will near 90 over a few interior areas. —NOAA
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Throughout the weekend and into the Fourth of July you can expect temperatures to be at or above 90 degrees in all except coastal locations. There may be several days where even the coastline off Cape Cod reaches 90.

Weekend details

Saturday and Sunday will feature plenty of sunshine. Sunday will be warmer than Saturday, and a little bit more humid as well. At times it may be so uncomfortable that it’ll be difficult to really do anything outside, especially between 11 in the morning and 5 in the afternoon.

More places will reach the 90s Saturday. —NOAA

Cape Cod weather

Across Cape Cod and the Islands there will be a wide range of temperatures, with some places away from the water and up toward the canal nearing 90 degrees during the weekend but Nantucket and Martha’s Vineyard, especially near the water, staying in the 70s. The UV index will be high after any early morning fog burns away. High tides will occur between 7 and 8 in the morning and evening.

Sunday will be very hot across a wide area of the Northeast. —Courtesy WeatherBell

Northern New England

Temperatures across Northern New England will range from the 90s to the mid-to-upper 80s over the higher elevated areas and northern part of Maine. It will be in the 70s east of Rockland across the Maine coast. Look for plenty of sunshine this weekend, although I can’t rule out a pop-up shower Saturday in the mountains.