The East Coast saw scorching temperatures again on Friday, as a dangerous heat wave is set to continue through the weekend.

Heat advisories have been issued up and down the East Coast, from South Carolina to Maine, with many locations expected to reach 100 degrees Saturday and Sunday. In places where temperatures will remain in the 90s, humidity will make it feel like a triple-digit day.

(MORE: Northeast Heat Advisory Heading Into The Weekend)

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Boston Mayor Michelle Wu extended the previously declared heat emergency through Sunday, as the city saw its third 90-plus degree day on Thursday, according to The Associated Press.

Excessive heat warnings stretched across the Deep South and parts of the mid-Atlantic for areas surpassing 105 degrees Fahrenheit for at least two consecutive hours. Dangerous temperatures are in the forecast for the region at least until the end of the month.

Cooling centers have sprung up across the U.S., as dangerous heat has plagued large swaths of the country in recent weeks, and officials warned Americans to heed the heat by seeking shelter, drinking water and checking on vulnerable neighbors.

The U.S. isn't the only place sweltering. This summer could be one of the hottest on record in the U.S., Europe and other parts of the world.

"Summer is supposed to be hot, but for the U.S. and Europe this year's deadly heat is far from ordinary," weather.com meteorologist Kait Parker explained. "With June tying the top spot for hottest June on record and July breaking heat records left-and-right, the globe is once again set to have one of hottest summers since records began. In fact, due to climate change, almost all of the top ten hottest summers have occurred in the 2000s."

Europe suffered a severe heat wave this week that is just beginning to abate, after killing more than 1,700 people in Spain and Portugal alone and igniting several wildfires around the continent. The U.K. clocked its highest all-time temperature on record on Tuesday, while the London Fire Brigade saw its busiest day since World War II as thousands of calls came from in and around the city.

Click through the slideshow above to see how the U.S. is dealing with the excessive heat.

MORE FROM WEATHER.COM: Photos from Europe's Deadly Heat Wave

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