Today | Weather | Thursday, July 23, 2026
Active Weather Warnings

Weather in Casper, Wyoming

01:24 AM
Now
Night
66° F
Feels Like 64°
Precipitation 0 %
Wind 6 mph
Humidity 76 %
Today
Sunny with a Chance of Thunderstorms
Day 82°
Night 63°
Precipitation 88 %
Wind 8 mph
UV Index (0 - 11+) 5

Casper Weather Forecast Updated

18 minutes ago
Last updated on

Air Quality in Casper

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.35 µg/m³
PM10 1.52 µg/m³
O3 0.037 ppm
NO2 0.6 ppb
SO2 0.1 ppb
CO 0.07 ppm
NH3 1.53 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)
PM2.51.35 µg/m³
PM101.52 µg/m³
O372.1 µg/m³
NO21.2 µg/m³
SO20.15 µg/m³
CO85.5 µg/m³
NH31.53 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Casper

Severe Future Possible

Flood Watch

Flood Watch issued July 22 at 12:54PM MDT until July 23 at 6:00AM MDT by NWS Riverton WY
Jul 22, 12:54 PM Jul 23, 6:00 AM
WHAT: Flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of central, north central, northwest, south
central, southwest, and west central Wyoming, including the
following areas, in central Wyoming, Casper Mountain, Green
Mountains and Rattlesnake Range, Lander Foothills, Natrona County
Lower Elevations, Owl Creek and Bridger Mountains, Southwest
Bighorn Basin, Upper Wind River Basin, Wind River Basin, Wind River
Mountains East and Wind River Mountains West. In north central
Wyoming, Bighorn Mountains Southeast, Bighorn Mountains West,
Northeast Johnson County, Southeast Bighorn Basin and Southeast
Johnson County. In northwest Wyoming, Absaroka Mountains, Cody
Foothills, Jackson Hole, North Bighorn Basin, Teton and Gros Ventre
Mountains and Yellowstone National Park. In south central Wyoming,
East Sweetwater County, Flaming Gorge and Rock Springs and Green
River. In southwest Wyoming, South Lincoln County. In west central
Wyoming, Salt River and Wyoming Ranges, Star Valley, Upper Green
River Basin and Upper Green River Basin Foothills.

WHEN: Until late Wednesday night. The most likely period of
possible flooding is between 3pm Wednesday through 4am MDT
Thursday.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- Slow moving showers and thunderstorms and abnormally high
moisture in the air can bring locally heavy rainfall that could
lead to flooding.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Updated: Jul 23, 1:06 AM Source: NWS Alert