Today | Weather | Tuesday, April 7, 2026

Active Weather Warnings

Red Flag Warning

Weather in Casper, Wyoming

07:39 AM

Now

36° F

Feels Like 27°

Precipitation 0 %

Wind 14 mph

UV Index (0 - 11+) 1

Humidity 65 %

Today

Day 72°

Night 34°

Precipitation 1 %

Wind 21 mph

UV Index (0 - 11+) 5

FROST FORECAST

Overnight Frost 3 AM – 6 AM

Casper Weather Forecast Updated

10 minutes ago

Last updated on April 07, 2026 at 7:29 AM

Air Quality in Casper

NOW

26 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 1.2 µg/m³

PM₁₀ 2.21 µg/m³

O₃ 0.028 ppm

NO₂ 1.7 ppb

SO₂ 0 ppb

CO 0.12 ppm

NH₃ 7.73 µg/m³

NO 0.25 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 – 1.2 µg/m³

PM₁₀ – 2.21 µg/m³

O₃ – 55.68 µg/m³

NO₂ – 3.27 µg/m³

SO₂ – 0.09 µg/m³

CO – 141.03 µg/m³

NH₃ – 7.73 µg/m³

NO – 0.25 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Casper

Severe Expected Likely

Red Flag Warning

Red Flag Warning issued April 7 at 12:47AM MDT until April 7 at 9:00PM MDT by NWS Riverton WY

Apr 7, 12:00 PM → Apr 7, 9:00 PM

The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from noon today to 9 PM MDT this
evening.

* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.

* AFFECTED AREA:
In Central WY Fire Zones...280...283...289.
In North Central WY Fire Zone....281.

* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Johnson.
In Southwest WY...Sweetwater.

* WIND: West 20 to 30 mph with gusts up to 40 to 50 mph.

* HUMIDITY: As low as 13 to 16 percent.

+ 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: Apr 7, 7:29 AM Source: NWS Alert