Denver weather: Records highs fall across Colorado as heatwave continues

The high temperature in Denver could approach 100 degrees on Friday and surpass triple-digits in Pueblo and other locations on the Plains, as Colorado endures one of its warmest September days on record, according to the National Weather Service in Boulder.

The forecast high of 98 degrees, which is expected to happen around 3 p.m., would be tied for the third hottest September day and the hottest day this late in the month, according to the National Weather Service. Denver’s all-time record high temperature in September was 101 degrees reached on Sept. 5, 2020, followed by a high of 100 reached on Sept. 2, 2019.

“It will be one of the top 10 warmest September days on record across our area, and the latest it’s been this hot or close to it,” meteorologists with the NWS said in their forecast. The predicted high is 17 degrees above the normal high in Denver for Sept. 10 and five degrees above the old record high for the day.

Fort Collins is expected to reach 97 degrees, Grand Junction and Colorado Springs should top out at 96 degrees and Pueblo is expected to reach a high of 101 degrees, its fourth hottest September day on record.

High heat combined with smoke from wildfires will result in a second action day for ozone and other pollutants across metro Denver and north into Boulder, Larimer and Weld Counties, according to the Colorado Department of Public Health and Environment.

Concentrations of ozone and fine particulates are expected to reach a level that is unhealthy for sensitive groups through 4 p.m., although that alert could be extended. Drivers are urged to avoid unnecessary trips.

“People with heart or lung disease, older adults, active adults, and children should reduce prolonged or heavy exertion throughout the Front Range region,” the alert warned.

For a second day, Denver Public Schools will close or go to a reduced schedule at several schools due to the high temperatures and a lack of air conditioning. McMeen Elementary School, Traylor Academy, Polaris Elementary School and Hamilton Middle School will be closed Friday.

Temperatures should fall on Saturday as a cold front approaches the state, but they will remain unseasonably warm for this time of year. Denver is expected to reach a high of 93 degrees, well above the average high of 81 degrees.

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