Today | Weather | Thursday, June 11, 2026

Active Weather Warnings

Red Flag Warning

Weather in Cheyenne, Wyoming

09:09 AM

Now

54° F

Feels Like 48°

Precipitation 0 %

Wind 20 mph

UV Index (0 - 11+) 4

Humidity 27 %

Today

Day 73°

Night 45°

Precipitation 1 %

Wind 18 mph

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Cheyenne Weather Forecast Updated

31 minutes ago

Last updated on June 11, 2026 at 8:38 AM

Air Quality in Cheyenne

NOW

37 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 0.86 µg/m³

PM₁₀ 2.33 µg/m³

O₃ 0.040 ppm

NO₂ 0.5 ppb

SO₂ 0.4 ppb

CO 0.06 ppm

NH₃ 0.95 µg/m³

NO 0.4 µg/m³

PM_2.5 – 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)

PM_2.5 – 0.86 µg/m³

PM₁₀ – 2.33 µg/m³

O₃ – 78.82 µg/m³

NO₂ – 1.01 µg/m³

SO₂ – 0.94 µg/m³

CO – 72.25 µg/m³

NH₃ – 0.95 µg/m³

NO – 0.4 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Cheyenne

Severe Expected Likely

Red Flag Warning

Red Flag Warning issued June 11 at 12:59AM MDT until June 12 at 8:00PM MDT by NWS Cheyenne WY

Jun 11, 12:59 AM → Jun 12, 8:00 PM

...RED FLAG WARNING WAS EXTENDED DUE GUSTY WINDS AND LOW RH
THROUGH FRIDAY EVENING....

* WIND...West to northwest winds 15 to 30 MPH with gusts up to 40
MPH.

* HUMIDITY...10 to 20 percent Thursday. 6 to 12 percent Friday.

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

+ 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: Jun 11, 8:38 AM Source: NWS Alert