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Washington, DC is in the grip of a dangerous, record-breaking heat wave — and it's not letting go anytime soon. The city hit 102°F on Friday, July 3, breaking a daily record of 101°F that had stood since 1872, according to CNN and WTOP. An Extreme Heat Warning is in effect, heat index values are forecast to reach 110 to 115 degrees, and Mayor Muriel Bowser has activated an Extreme Heat Alert as the District opens cooling centers, extra rec centers, pools and splash pads. Here's everything you need to know.

How Long Will the DC Heat Wave Last?

The short answer: through at least Sunday, July 5 — and the heat could linger into next week.

  • Extreme Heat Alert: Mayor Bowser activated the District's Extreme Heat Alert from Wednesday, July 1 through Sunday, July 5, warning residents to plan for "several days of dangerously hot temperatures." Officials say it may be extended depending on the forecast.
  • Peak heat: Friday, July 3 and Saturday, July 4 are targeted as the hottest days, with highs of 100–105°F, per National Weather Service warnings cited by local outlets.
  • Slight easing Sunday: The Weather Channel reports temperatures may ease back into the middle and upper 90s on Sunday — but humidity stays high and heat index values are still forecast to exceed 100 degrees in the afternoon.

In other words, the heat wave that began around July 1 is forecast to run roughly a week, with the most dangerous conditions through the July 4th holiday weekend. This is all part of a massive heat dome baking much of the US before July 4th, stretching from the Midwest to the East Coast.

How Hot Will It Get in Washington DC?

Brutally hot — and historically hot.

  • Record already broken: DC reached 102°F on Friday, July 3, surpassing the 101°F daily record set in 1872, per CNN. More than a dozen Mid-Atlantic and Northeast locations broke or tied records the same day.
  • July 4th could make history: The forecast high for Saturday is 102°F — which would make it the hottest Fourth of July ever recorded in Washington, according to The Washington Post and NBC4 Washington.
  • Heat index up to 115: With tropical humidity layered on top, "feels-like" temperatures are forecast to hit 110–115°F, per WJLA's First Alert Weather team — conditions the NWS calls potentially life-threatening for anyone outdoors for extended periods.
  • Real-world impact: The extreme heat has already canceled or scaled back July 4th events in DC and Philadelphia, per the BBC, and The New York Times reports emergency medical calls in the District are climbing.

Heat Warnings in Effect for DC, Maryland and Virginia

The National Weather Service has the region blanketed in alerts:

  • Extreme Heat Warning: In effect for Washington, DC and much of the DMV, running 10 a.m. to 9 p.m. Saturday, with temperatures of 100–105°F and heat index values of 110–115.
  • DC Extreme Heat Alert: The Mayor's alert (July 1–5) activates the District's heat emergency plan — expanding cooling centers, hydration stations and EMS resources.
  • CDC warning: The CDC says the region is seeing "extremely high" rates of heat-related emergency room visits, per CNN.
  • Storm risk: WJLA notes the heat could break down with strong thunderstorms — damaging winds, hail and lightning are possible as a front eventually pushes through.

Planning your holiday around the heat? Check our guide to what's open and closed on July 4, 2026.

DC Cooling Centers & Safety Tips

The District operates free cooling centers across the city whenever a heat emergency is declared. Here's how to find relief:

  • Find a cooling center: Visit heat.dc.gov or call 311 for the full list of locations and hours — sites include community centers, libraries and rec centers.
  • Extra rec centers: DC officials opened 10 additional recreation centers on Friday and Saturday that would normally be closed for the holiday, per WJLA.
  • Pools and splash pads: All outdoor pools and splash pads are open 10 a.m. to 6 p.m. through the holiday weekend.
  • Suburbs too: Fairfax, Arlington, Montgomery and Prince George's counties have all opened cooling centers, libraries and community centers as heat relief sites.

Heat safety basics, per the NWS and ReadyDC:

  • Drink water constantly — don't wait until you're thirsty.
  • Stay in air conditioning during the peak 11 a.m.–7 p.m. window; limit outdoor activity to early morning or evening.
  • Never leave children or pets in a parked car — even for a few minutes.
  • Check on elderly neighbors and anyone without AC.
  • Know the signs of heat stroke: confusion, dizziness, hot dry skin, rapid pulse — call 911 immediately.

Frequently Asked Questions (FAQ)

How long will the DC heat wave last?

DC's Extreme Heat Alert runs from July 1 through at least Sunday, July 5, and officials say it could be extended. The Weather Channel forecasts slight easing Sunday (mid-to-upper 90s), but heat index values are still expected to top 100 — making this roughly a week-long heat event.

How hot will it get in Washington DC?

Highs of 100–105°F with heat index values of 110–115. DC already hit 102°F on July 3, breaking a record from 1872, and Saturday's forecast 102°F would be the hottest July 4th in the city's recorded history.

Where are the cooling centers in DC?

Free cooling centers are open at community centers, libraries and rec centers across the District. Find locations at heat.dc.gov or by calling 311. Ten extra rec centers are open through the holiday, and all outdoor pools and splash pads run 10 a.m. to 6 p.m.

Is there an Extreme Heat Warning for DC right now?

Yes. The National Weather Service has an Extreme Heat Warning in effect for Washington, DC and much of the DMV, including 10 a.m. to 9 p.m. Saturday, July 4, with potentially life-threatening heat index values of 110–115 degrees.