Hourly Weather | Today Thursday, July 23, 2026
Active Weather Warnings
Casper, Wyoming
3 AM
Stormy Weather
66°
Feels Like 63°
54
Humidity: 89%
UV Index: 0
Wind: 6 mph
4 AM
Cloudy Weather
66°
Feels Like 64°
49
Humidity: 91%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Weather
66°
Feels Like 64°
34
Humidity: 90%
UV Index: 0
Wind: 7 mph
6 AM
Cloudy Weather
66°
Feels Like 64°
34
Humidity: 88%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
68°
Feels Like 66°
34
Humidity: 84%
UV Index: 1
Wind: 7 mph
8 AM
Cloudy Weather
70°
Feels Like 70°
34
Humidity: 77%
UV Index: 1
Wind: 8 mph
9 AM
Cloudy Weather
72°
Feels Like 73°
34
Humidity: 70%
UV Index: 2
Wind: 9 mph
10 AM
Cloudy Weather
75°
Feels Like 75°
37
Humidity: 64%
UV Index: 3
Wind: 9 mph
11 AM
Cloudy Weather
77°
Feels Like 79°
47
Humidity: 60%
UV Index: 4
Wind: 8 mph
12 PM
Sunny with a Chance of Thunderstorms
77°
Feels Like 75°
51
Humidity: 60%
UV Index: 3
Wind: 8 mph
1 PM
Cloudy Weather
79°
Feels Like 82°
43
Humidity: 54%
UV Index: 5
Wind: 8 mph
2 PM
Stormy Weather
79°
Feels Like 75°
59
Humidity: 59%
UV Index: 2
Wind: 7 mph
3 PM
Stormy Weather
81°
Feels Like 79°
51
Humidity: 51%
UV Index: 2
Wind: 7 mph
4 PM
Cloudy Weather
82°
Feels Like 82°
49
Humidity: 46%
UV Index: 2
Wind: 8 mph
5 PM
Cloudy Weather
81°
Feels Like 81°
34
Humidity: 45%
UV Index: 2
Wind: 8 mph
6 PM
Cloudy Weather
81°
Feels Like 79°
34
Humidity: 47%
UV Index: 1
Wind: 8 mph
7 PM
Cloudy Weather
81°
Feels Like 79°
22
Humidity: 49%
UV Index: 1
Wind: 8 mph
8 PM
Cloudy Weather
79°
Feels Like 75°
0
Humidity: 53%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
75°
Feels Like 72°
0
Humidity: 59%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
72°
Feels Like 70°
0
Humidity: 65%
UV Index: 0
Wind: 7 mph
11 PM
Night
70°
Feels Like 66°
0
Humidity: 72%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.93 µg/m³
  • PM10: 1.14 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

4 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.76 µg/m³
  • PM10: 1 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

5 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.69 µg/m³
  • PM10: 0.94 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

6 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.72 µg/m³
  • PM10: 0.96 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

7 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.75 µg/m³
  • PM10: 1.06 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

8 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.77 µg/m³
  • PM10: 1.22 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

9 AM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.81 µg/m³
  • PM10: 1.4 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

10 AM
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.83 µg/m³
  • PM10: 1.42 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

11 AM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.98 µg/m³
  • PM10: 1.49 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

12 PM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.28 µg/m³
  • PM10: 1.78 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

1 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.78 µg/m³
  • PM10: 2.23 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

2 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.2 µg/m³
  • PM10: 2.57 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

3 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.43 µg/m³
  • PM10: 2.76 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

4 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.66 µg/m³
  • PM10: 2.97 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

5 PM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.82 µg/m³
  • PM10: 3.12 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

6 PM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.91 µg/m³
  • PM10: 3.21 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

7 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.81 µg/m³
  • PM10: 3.14 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

8 PM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.68 µg/m³
  • PM10: 3.02 µg/m³
  • O3: 0.044 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

9 PM
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.58 µg/m³
  • PM10: 2.92 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.5 µg/m³
  • PM10: 2.83 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

11 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.46 µg/m³
  • PM10: 2.8 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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