It’ll be blazing hot this weekend. Here’s David Epstein’s forecast.

Much of the region could wind up with an official heat wave from Friday through Sunday.

Children play in a fountain on the Rose Kennedy Greenway as temperatures rose into the high 90s back in 2018.
Children play in a fountain on the Rose Kennedy Greenway as temperatures rose into the high 90s back in 2018. –John Cetrino / EPA-EFE / Shutterstock

We got a bit of a reprieve from all the heat and humidity on Thursday, but it’s coming back Friday and ratcheting up through the weekend as a warm front crosses the area.

That means very high humidity and hot temperatures — it’s going to feel in the high 90s and above 100 degrees for much of the weekend — so be careful out there.

Here’s your complete weather forecast for the third weekend of July.

It’ll be nearly 90 degrees on Friday.

high temperatures friday
Highs Friday will be in the 80s to near 90 degrees in most areas. —WeatherBell

Friday afternoon’s readings will reach the upper 80s to around 90 degrees. If Boston does reach 90, we’re in for an heat wave in the coming days. There’s only a very small chance the weekend won’t exceed 90 degrees at Logan Airport. That would mean three 90-degree days in a row, which qualifies for an official heat wave.

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As the humidity increases throughout the day, it will become more and more uncomfortable. This will set the stage for several hot nights ahead. In Boston, temperatures will remain at or above 80 degrees for most of the nighttime hours through Sunday night, but the official lows will likely be just under that.

An excessive heat warning is in effect for Saturday.

Saturday afternoon will feel well over 100 degrees. These are the projected heat indices. —WeatherBell

There is an excessive heat warning for much of the area on Saturday.

These warnings are issued when the temperature feels like it’s going to be excessively hot due to a combination of heat and humidity. In this case, it could feel as high as 108 degrees for several hours during the middle part of the day.

This is dangerous heat, so it’s inadvisable to exert yourself while outside as you could end up with heat exhaustion or heat stroke. Both of these are serious medical situations. If you need to be outside, just take it easy, stay hydrated, and try to get into a cool area as often as possible. The best time to go for a run or to walk the dog will be from 5 a.m. to 8 a.m.

A light sea breeze Saturday could give some relief. These are hard to predict in this pattern, but some models are forecasting a breeze just at the immediate coast. A stronger sea breeze would keep any areas from reaching 100 degrees.

Sunday will be very hot, too.

high temperatures sunday
Sunday will be another very hot day for all of New England. —WeatherBell
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Once again, Sunday looks like it’ll be very hot. There’s a possibility it’s just as hot — or even hotter — than Saturday, and the humidity will be equally as high. Any change will be negligible between Saturday and Sunday.

Sunday will feature plenty of sunshine with just a few puffy clouds developing in the afternoon.

Water temperatures are very warm in most spots with readings in the upper 60s and 70s on the south side of Cape Cod and in sheltered coves.

Next week will be hot, but not as excessively hot.

A cool-down begins Monday with temperatures likely staying just under 90 degrees with a slow drop in humidity by the end of the day and overnight.

Better relief comes late Monday night and into Tuesday when we’ll finally be able to enjoy summer weather again. Comfortable temperatures at seasonable levels should close out the month.

We probably are not done with heat, but this upcoming weekend will most likely end up as the hottest of the entire summer.

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