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Temperatures will begin to dip on Wednesday, but D.C. and Philadelphia could still see record highs.

Relief from the oppressive heat will then arrive on Thursday. Temperatures will drop to 69 degrees in Boston, 78 in New York City, 91 in Philadelphia and 93 in D.C.

Click here for what you need to know to stay safe in the heat.

ABC News' Dan Peck contributed to this report.

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