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Get ready, folks, we’re about to have a heat wave.

And I think when we look back in September, we’ll see that the warmest day and the warmest week of this summer will have occurred over this weekend and next week.

This is perhaps an ideal time for the strongest heat of summer, as many of you will be taking some time off.

While we may not break any records during the next seven days, I do think that many of us who live just a couple of miles away from the immediate coast will experience 90-plus degree weather for five to as many as seven days.

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Inland areas will reach 90 or higher starting Friday and continuing through most of next week.
Inland areas will reach 90 or higher starting Friday and continuing through most of next week.NOAA

The longest heat wave in Boston recorded before official weather observations moved to Logan Airport was nine days long, but there was even an eight-day heat wave at Logan in 2002. This particular heat wave could last close to a week in some of the inland areas, especially west of Route 495.

The longest runs of consecutive 90-degree days in Boston.
The longest runs of consecutive 90-degree days in Boston.Dave Epstein/NOAA data

It’s supposed to be hot

It’s worth noting that typically the peak temperatures occur in the third week of July, but this is just an average. We have seen the warmest temperature of summer occur as early as June and as late as September.

Temperatures typically peak the third week of July, but this can happen earlier or later.
Temperatures typically peak the third week of July, but this can happen earlier or later.Dave Epstein/NOAA data

The sun is still powerful

The sun is already becoming slightly weaker each day, almost negligibly, but something called seasonal lag — the idea that the maximum and minimum temperatures occur after the solstices — is at play.

The sun’s maximum intensity was reached on the summer solstice.
The sun’s maximum intensity was reached on the summer solstice.TimeandDate.com

High humidity means big heat indices

Along with the upcoming heat, there will be plenty of humidity. We may see a day or two where the humidity drops a little bit, but it is going to range between noticeable and oppressive for the next week.

Once the heat index exceeds 95 degrees for a couple of days or is as high as 100 for a day, then heat advisories will be issued. A more severe warning would be an excessive heat warning. These get issued with readings of more than 105 degrees.

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The temperature could feel like it’s more than 100 degrees for several hours each afternoon Sunday, Monday, and Tuesday, especially inland.
The temperature could feel like it’s more than 100 degrees for several hours each afternoon Sunday, Monday, and Tuesday, especially inland.Courtesy WeatherBell

When might it break?

There is a good chance that Boston itself gets at least one or more days below 90 because of a sea breeze, but for the majority of us who don’t live near the water, the heat may not fully break until next weekend. Interestingly, Boston must have three consecutive days of 90 or higher to have an official heat wave. It could be that Cambridge hits 90 three days in a row for a heat wave, while Logan Airport stays cooler; time will tell.


Follow Dave Epstein on Twitter@growingwisdom.