Today | Weather | Wednesday, March 18, 2026
Active Weather Warnings

Weather in Cheyenne, Wyoming

03:47 AM
Now
Cloudy Night
46° F
Feels Like 36°
Precipitation 0 %
Wind 21 mph
Humidity 41 %
Today
Cloudy Weather
Day 75°
Night 48°
Precipitation 1 %
Wind 24 mph
UV Index (0 - 11+) 5

Warning: Strong Winds Today: 24 mph

Cheyenne Weather Forecast Updated

19 minutes ago
Last updated on

Air Quality in Cheyenne

NOW
37 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1 µg/m³
PM10 2.55 µg/m³
O3 0.040 ppm
NO2 0.4 ppb
SO2 0.6 ppb
CO 0.08 ppm
NH3 0.36 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.51 µg/m³
PM102.55 µg/m³
O377.76 µg/m³
NO20.74 µg/m³
SO21.65 µg/m³
CO88.06 µg/m³
NH30.36 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Cheyenne

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued March 17 at 12:17AM MDT until March 21 at 8:00PM MDT by NWS Cheyenne WY
Mar 18, 10:00 AM Mar 21, 8:00 PM
...TWO PART FIRE WEATHER WATCH...

.PART ONE WILL FEATURE STRONG WINDS AND MARGINAL RELATIVE
HUMIDITY, PART TWO WILL FEATURE GUSTY WINDS, CRITICAL RELATIVE
HUMIDITY AND POOR OVERNIGHT HUMIDITY RECOVERIES.

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH SATURDAY EVENING FOR LOW HUMIDITY WITH STRONG AND GUSTY
WINDS FOR FIRE WEATHER ZONES 430, 431, 432, 433, 436, AND 437...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 10 AM this morning to 8 PM MDT
this evening.

* AFFECTED AREA...Fire weather zone 430, 431, 432, 433, 436, and
437.

* WIND...For the Red Flag Warning, sustained winds 25 to 30
mph, gusting up to 40 mph. For the Fire Weather Watch,
sustained winds 20 to 30 mph, gusting up to 35 mph.

* HUMIDITY...For the Red Flag Warning, 18 to 22 percent. For
the Fire Weather Watch, 10 to 15 percent.

IMPACTS: Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

ADDITIONAL DETAILS: Poor overnight humidity recoveries are
expected for the duration of the Fire Weather Watch. Well
above average temperatures are also expected which will
contribute considerably to the dry conditions.
+ Read More
A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Updated: Mar 17, 11:08 AM Source: NWS Alert
Severe Expected Likely

Red Flag Warning

Red Flag Warning issued March 18 at 12:08AM MDT until March 21 at 8:00PM MDT by NWS Cheyenne WY
Mar 18, 10:00 AM Mar 21, 8:00 PM
...Multi Day Red Flag Warning...

.Critical fire conditions are expected through the week, with poor
overnight humidity recoveries and no precipitation.

* AFFECTED AREA...Fire weather zone 417, 418, 419, 430, 431, 432,
433, 434, 435, 436, and 437.

* WIND...Sustained winds 20 to 30 mph, gusting up to 35 mph.

* HUMIDITY...10 to 15 percent.

IMPACTS: Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

ADDITIONAL DETAILS: Poor overnight humidity recoveries are
expected for the duration of the Red Flag Warning. Well above
average temperatures are also expected which will contribute
considerably to the dry conditions.
+ Read More
A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
Updated: Mar 18, 3:28 AM Source: NWS Alert