Denver officially cracked 100 degrees for the first time this year Monday, as near-record heat bore down across Colorado.

The National Weather Service reported the milestone at about 2:52 p.m. at its measuring station at Denver International Airport. While the heat broke the triple-digit threshold for the first time in 2026, it fell short of the record of 105 degrees, recorded on this day in 2005.

That record is tied for both the highest recorded temperature in July and the city of Denver overall.

Temperatures across the urban corridor and Eastern Plains were expected to reach or exceed 100 degrees, forecasters said.

Other highs forecast by the weather service for Monday include:

• 84 degrees in Breckenridge, just short of the 85-degree record set in 1901
• 98 degrees in Castle Rock, which would tie the city’s daily heat record set in 2019
• 99 degrees in Boulder, just short of the 100-degree record set in 1998
• 99 degrees in Wheat Ridge, just short of the 100-degree record set in 2005
• 100 degrees in Longmont, four degrees short of the 104-degree record set in 1030
• 101 degrees in Brighton, which would tie the heat record set in 2019
• 101 degrees in Fort Collins, which would tie the city’s daily heat record set in 1998
• 101 degrees in Greeley, five degrees short of the 106-degree daily heat record set in 1998
• 101 degrees in Julesburg, six degrees short of the 107-degree record set in 1934

A heat advisory issued by the weather service will be in effect for parts of Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer and Weld counties until 9 p.m. Monday.

The weather is expected to remain hot Tuesday and Wednesday, but with a bit less bite. Highs both days are forecast for the low-to-mid 90s, with chances of rain each afternoon, according to the weather service.

This is a developing story and may be updated.

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