Heat Wave Closes in on the Northeast: What You Need to Know

PHOTO: A woman sunbathes at Rockaway Beach, July 26, 2016, in New York. A heat wave continues with temperatures expected to stay in the 90s across most of the Eastern U.S until this weekend. PlayKena Betancur/Getty Images
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A heat wave is closing in on the Northeast today, and by the weekend the heat index could climb to over 100 degrees in Philadelphia.

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Here's what you need to know.

A Heat Advisory for New York City

PHOTO: A woman sunbathes as the temperature in New York feels like 100 degrees, July 25, 2016. Kena Betancur/Getty Images
A woman sunbathes as the temperature in New York feels like 100 degrees, July 25, 2016.

New York City's Heat Advisory will begin at 2 p.m. today, lasting until 8 p.m. Thursday.

The heat index, which is what the temperature feels like, will reach the mid 90s this afternoon and upper 90s on Thursday.

Actual temperatures will reach the mid to upper 80s today and upper 80s to 90 degrees Thursday.

Another Heat Advisory in Boston

PHOTO: A Camp Vibrant camper cools off in the Christian Science Center fountain in Boston, Massachusetts, July 25, 2016.
Jessica Rinaldi/Boston Globe/Getty Images
A Camp Vibrant camper cools off in the Christian Science Center fountain in Boston, Massachusetts, July 25, 2016.

In Boston, a Heat Advisory will be in effect Thursday from noon to 7 p.m. as the heat index reaches about 100 degrees and temperatures soar to the mid 90s.

An Excessive Heat Watch in Philadelphia

In Philadelphia, an Excessive Heat Watch will be in effect from Thursday afternoon through Saturday afternoon.

The heat index could near 100 degrees Thursday and climb to 105 on Friday and Saturday.

Actual temperatures are expected to be in the low 90s on Thursday and mid 90s on Friday and Saturday.

ABC News' Jessica Ptashenchuk and Melissa Griffin contributed to this report.

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