The temperature in Denver hit 100 degrees Wednesday afternoon, according to the National Weather Service station at Denver International Airport — the first time this year that mark has been reached.

That temperature ties the record for the hottest day, which was set on July 9, 2022, according to the NWS Boulder, and stands as the hottest day of 2025.

The city came under a heat advisory at 10 a.m. Wednesday morning, with it expected to last until 9 p.m. that night. 

Denver weather: Will record heat happen Wednesday across the city?

In anticipation of the extreme heat, Denver activated cooling centers around the city, with designated areas available for cooling, bathrooms and places to sit, according to a news release from the Denver Department of Public Health and Environment.

Additionally, Denver Public Library locations will be available to members of the public looking to get out of the heat, according to the release. People can also call 720-865-5444 to learn about the status of cooling centers.

Denver to activate cooling centers amid extreme heat Wednesday

After the scorching daytime heat, temperatures are expected to drop until about 69 degrees Wednesday night. 

According to The Denver Gazette’s news partners 9NEWS Meteorologist Chris Bianchi that low temp overnight might not be enough to cool things down in the house, if there’s no air conditioning. 

“Important: It’s not just that we’re hitting 100° today – it’s our *low* temperatures that are just as important,” he said in a social media post on X. “Lows tonight near 70° = can’t leave windows open (nighttime temps are mostly 75-85) = can’t efficiently cool off as usual.”

He posted on X at 2 p.m. that the 99-degree mark reached is the hottest day of the year thus far. 

Metro Denver hit the century mark six times in 2024, according to the NWS. 

The next few days will all be mostly sunny, with temperatures in the high 80s and low 90s and a significant chance of thunderstorms each afternoon.