Hourly Weather Forecast for Cheyenne, Wyoming

Hourly Weather | Today › Wednesday, March 18, 2026

Active Weather Warnings

Fire Weather Watch
Red Flag Warning
High Wind Warning

Cheyenne, Wyoming

6 AM

46°

Feels Like 34°

Humidity: 39%

UV Index: 0

Wind: 21 mph

7 AM

46°

Feels Like 34°

Humidity: 42%

UV Index: 0

Wind: 22 mph

8 AM

48°

Feels Like 39°

Humidity: 35%

UV Index: 1

Wind: 20 mph

9 AM

54°

Feels Like 45°

Humidity: 30%

UV Index: 2

Wind: 22 mph

10 AM

57°

Feels Like 52°

Humidity: 25%

UV Index: 3

Wind: 24 mph

11 AM

64°

Feels Like 61°

Humidity: 18%

UV Index: 4

Wind: 25 mph

12 PM

68°

Feels Like 66°

Humidity: 15%

UV Index: 5

Wind: 27 mph

1 PM

72°

Feels Like 70°

Humidity: 13%

UV Index: 5

Wind: 28 mph

2 PM

73°

Feels Like 72°

Humidity: 13%

UV Index: 5

Wind: 28 mph

3 PM

73°

Feels Like 72°

Humidity: 13%

UV Index: 4

Wind: 28 mph

4 PM

75°

Feels Like 72°

Humidity: 13%

UV Index: 3

Wind: 27 mph

5 PM

73°

Feels Like 70°

Humidity: 14%

UV Index: 2

Wind: 24 mph

6 PM

72°

Feels Like 66°

Humidity: 16%

UV Index: 1

Wind: 23 mph

7 PM

66°

Feels Like 63°

Humidity: 19%

UV Index: 0

Wind: 22 mph

8 PM

64°

Feels Like 59°

Humidity: 22%

UV Index: 0

Wind: 17 mph

9 PM

61°

Feels Like 55°

Humidity: 25%

UV Index: 0

Wind: 16 mph

10 PM

57°

Feels Like 52°

Humidity: 27%

UV Index: 0

Wind: 15 mph

11 PM

55°

Feels Like 50°

Humidity: 29%

UV Index: 0

Wind: 15 mph

Hourly Air Quality Forecast - AQI (US EPA)

6 AM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.97 µg/m³
PM₁₀: 2.12 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

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

7 AM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.91 µg/m³
PM₁₀: 1.88 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

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

8 AM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.84 µg/m³
PM₁₀: 1.68 µg/m³
O₃: 0.041 ppm
NO₂: 0.5 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

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

9 AM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.78 µg/m³
PM₁₀: 1.51 µg/m³
O₃: 0.042 ppm
NO₂: 0.6 ppb
SO₂: 0.5 ppb
CO: 0.08 ppm

Health Recommendations:

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

10 AM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.73 µg/m³
PM₁₀: 1.35 µg/m³
O₃: 0.044 ppm
NO₂: 0.4 ppb
SO₂: 0.4 ppb
CO: 0.08 ppm

Health Recommendations:

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

11 AM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.8 µg/m³
PM₁₀: 1.34 µg/m³
O₃: 0.044 ppm
NO₂: 0.3 ppb
SO₂: 0.4 ppb
CO: 0.08 ppm

Health Recommendations:

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

12 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.96 µg/m³
PM₁₀: 1.44 µg/m³
O₃: 0.044 ppm
NO₂: 0.2 ppb
SO₂: 0.4 ppb
CO: 0.08 ppm

Health Recommendations:

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

1 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.18 µg/m³
PM₁₀: 1.59 µg/m³
O₃: 0.044 ppm
NO₂: 0.2 ppb
SO₂: 0.4 ppb
CO: 0.07 ppm

Health Recommendations:

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

2 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.37 µg/m³
PM₁₀: 1.72 µg/m³
O₃: 0.044 ppm
NO₂: 0.1 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

3 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.49 µg/m³
PM₁₀: 1.79 µg/m³
O₃: 0.044 ppm
NO₂: 0.1 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

4 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.49 µg/m³
PM₁₀: 1.75 µg/m³
O₃: 0.044 ppm
NO₂: 0.1 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

5 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.4 µg/m³
PM₁₀: 1.65 µg/m³
O₃: 0.045 ppm
NO₂: 0.2 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

6 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.28 µg/m³
PM₁₀: 1.53 µg/m³
O₃: 0.044 ppm
NO₂: 0.3 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

7 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.14 µg/m³
PM₁₀: 1.42 µg/m³
O₃: 0.043 ppm
NO₂: 0.6 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

8 PM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.02 µg/m³
PM₁₀: 1.36 µg/m³
O₃: 0.041 ppm
NO₂: 0.9 ppb
SO₂: 0.4 ppb
CO: 0.07 ppm

Health Recommendations:

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

9 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.92 µg/m³
PM₁₀: 1.31 µg/m³
O₃: 0.039 ppm
NO₂: 1 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

10 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.82 µg/m³
PM₁₀: 1.25 µg/m³
O₃: 0.039 ppm
NO₂: 1 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

11 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.73 µg/m³
PM₁₀: 1.2 µg/m³
O₃: 0.039 ppm
NO₂: 0.9 ppb
SO₂: 0.5 ppb
CO: 0.07 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

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, 5:01 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Cheyenne

Fire Weather Watch

Red Flag Warning

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