Weather Alerts for Denver

Issued by the National Weather Service

Heat Advisory  HEAT ADVISORY   Heat Advisory
DENVER

Areas Affected:
Larimer County Below 6000 Feet/Northwest Weld County - Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County - North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County - Central and South Weld County
Effective: Fri, 7/17 12:00pm Updated: Sat, 7/18 3:20am Urgency: Expected
Expires: Sat, 7/18 6:45am Severity:  Moderate  Certainty: Likely

 
Details:
* WHAT...High temperatures between 99-102 expected. Low temperatures
Sunday night will be between 69-71 in the Denver metro.

* WHERE...Fort Collins, Boulder and the western suburbs of Denver,
Denver, and Greeley.

* WHEN...From 10 AM Sunday to 9 PM MDT Monday.

* IMPACTS...Hot temperatures may cause heat illnesses.

Information:
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

Take extra precautions when outside. 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.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

Air Quality Alert  AIR QUALITY ALERT   Air Quality Alert
DENVER

Areas Affected:
Arapahoe, CO - Adams, CO - Denver, CO - Broomfield, CO - Jefferson, CO - Boulder, CO - Larimer, CO - Weld, CO - Douglas, CO
Effective: Fri, 7/17 4:10pm Updated: Sat, 7/18 3:20am Urgency: Unknown
Expires: Sat, 7/18 4:00pm Severity: Unknown Certainty: Unknown

 
Details:
The Colorado Department of Public Health and Environment has
issued the following...

WHAT...Ozone Action Day Alert.

WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties

WHEN...400 PM Friday July 17 to 400 PM Saturday July 18

IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor.  Hot and sunny weather will result in
concentrations of ozone reaching the Unhealthy for Sensitive
Groups category on Friday and Saturday. The highest concentrations
are most likely in the western portions of the Denver Metro area,
including the lower foothills.   For Colorado air quality
conditions, forecasts, and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx   If
possible, please help us reduce ozone pollution by limiting
driving gas and diesel-powered vehicles until at least 4 p.m.
Saturday, July 18, 2026. Colorado is also addressing ozone
pollution through state policies. For more information about
health impacts and how ozone pollution forms in Colorado, visit:
https://cdphe.colorado.gov/ozone- pollution-and-your-health

HEALTH INFORMATION...Increasing likelihood of respiratory symptoms
and breathing discomfort in active children and adults and people
with lung disease, such as asthma. Active children and adults, and
people with lung disease, such as asthma, should reduce prolonged
or heavy outdoor exertion.