Wednesday is expected to be the hottest day of 2026 so far, with temperatures hitting triple digits in southeastern Colorado and the upper 90s in Denver, according to the National Weather Service.
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Denver temperatures are expected to climb into the 90s by 1 p.m. Wednesday and peak at 96 degrees near 5 p.m., according to hourly forecasts from the weather service. The current Denver heat record for June 17 is 100 degrees, set in 2021.
In southeastern Colorado, weather service forecasts include:
- 101 degrees in Trinidad, which would break the city’s 98-degree heat record for June 17, set in 2021
- 103 degrees in Pueblo, which would tie the city’s record for hottest June 17, set in 2021
- 103 degrees in Lamar, falling just short of the city’s 104-degree record, set in 1939
- 105 degrees in La Junta, which would break the city’s 104-degree heat record for June 17, set in 2021
Triple-digit temperatures will also affect a limited area on Colorado’s Western Slope, including Grand Junction, according to the weather service. Temperatures are expected to hit 101 degrees by 4 p.m. in Grand Junction, just short of the 104-degree record set in 2021, according to the weather service.
A heat advisory will be in effect on Wednesday from 11 a.m. to 7 p.m. for parts of El Paso, Fremont and Pueblo counties in southern Colorado, according to the weather service. Temperatures between 97 and 105 degrees are expected and may cause heat-related illnesses, forecasters said in the advisory.
“Take extra precautions when outside,” forecasters wrote. “Wear lightweight and loose-fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.”
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Red flag warnings will also be active for most of western Colorado from noon to 8 p.m. on Wednesday, according to the weather service. The warnings include parts of Boulder, Chaffee, Clear Creek, Fremont, Gilpin, Grand, Huerfano, Jackson, Lake, Larimer, Las Animas, Mesa, Park, Pueblo, Summit and Teller counties.
Wind gusts up to 50 mph and humidity as low as 10% are expected, forecasters said.
“Conditions will be favorable for rapid fire spread,” weather service forecasters wrote in the alerts. “Avoid outdoor burning and any activity that may produce a spark and start a wildfire.”
This is a developing story and may be updated.
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