Washington area residents are going to experience a sweltering first half of the week, as an extreme heat alert is in effect until Thursday morning.

Feels-like temperatures will exceed 100 degrees during the daytime on Monday through Wednesday.

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City officials are urging residents to stay indoors and to drink water.

“Heat Alert (7/28) Temps are expected to be over 99 degrees heat index,” DC Homeland Security & Emergency Management posted on X. “Stay hydrated, avoid outdoor activity, wear light clothes & check on elderly/kids. Visit http://Heat.dc.gov to find the nearest cooling center near you. For more updates follow AlertDC.”

Mayor Muriel Bowser reposted the alert on X.

Some of the hottest temperatures will be on Tuesday and Wednesday, when the heat index will exceed 103 degrees. On Thursday and throughout the rest of the week, there will be showers and cooler temperatures.

“High temperatures today through Wednesday will soar well into the 90s,” 7News Senior Meteorologist Brian van de Graaff reported. “We’ll catch a break from the storms, but heat index values will peak in the low 100s this afternoon, so make sure you’re practicing heat safety by staying hydrated, taking breaks in the shade and/or AC, and monitoring how you are feeling. Dangerously hot and humid weather will stay with us through mid-week, with a strong front bringing relief by Thursday.”

The heat is part of a wider southern and eastern U.S. heat wave that has the heat index exceeding 100 degrees for most states, including the Carolinas, Georgia, and Florida.

Heat indexes will exceed 90 degrees in almost all of Virginia, Maryland, and New Jersey, while affecting portions of New York and Pennsylvania.

The heat will cease for most of the Northeast by Thursday. Washington contended with its first heat wave of the season in late June.

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Congress sought to address this summer’s heat in a bill that would make extreme heat eligible for a disaster declaration from the president.

The Extreme Heat Emergency Act from Sens. Ruben Gallego (D-AZ) and Jacky Rosen (D-NV) would “explicitly authorize extreme heat as eligible for a Major Disaster Declaration” by the president of the United States under the Stafford Act, a 1980s law relating to weather events.