* WHAT...High temperatures in the upper 90s.

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

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

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

WWUS75 KBOU 121911
NPWBOU

Heat Advisory
National Weather Service Denver CO
111 PM MDT Sun Jul 12 2026
COZ038>040
/O.NEW.KBOU.HT.Y.0001.260713T1600Z-260714T0300Z/
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

...HEAT ADVISORY IN EFFECT FROM 10 AM TO 9 PM MDT MONDAY...

* WHAT...High temperatures in the upper 90s.

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

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

* IMPACTS...Hot temperatures may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

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.

HEAT ADVISORY

Heat Advisory issued July 12 at 1:11PM MDT until July 13 at 9:00PM MDT by NWS Denver CO

larimer county below 6000 feet/northwest weld county

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 Saturday July 11 to 400 PM Sunday July 12

IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor.  Hot, dry, and stagnant weather will allow
ozone to reach the Unhealthy for Sensitive Groups category on
Saturday and Sunday. 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.
Sunday, July 12, 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.

AEUS75 KBOU 112210
AQABOU

Air Quality Alert
National Weather Service Denver CO
410 PM MDT Sat Jul 11 2026
COC001-005-013-014-031-035-059-069-123
Larimer, CO-Jefferson, CO-Arapahoe, CO-Douglas, CO-Weld, CO-Denver, CO-Boulder, CO-Adams, CO-Broomfield, CO

...OZONE ACTION DAY ALERT FROM 400 PM SATURDAY UNTIL 400 PM SUNDAY...

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 Saturday July 11 to 400 PM Sunday July 12

IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor.  Hot, dry, and stagnant weather will allow
ozone to reach the Unhealthy for Sensitive Groups category on
Saturday and Sunday. 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.
Sunday, July 12, 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.

Local Weather

Denver, Colorado, US
2