Hourly Weather Forecast for Casper, Wyoming

Hourly Weather | Today › Wednesday, March 18, 2026

Active Weather Warnings

Fire Weather Watch
Red Flag Warning
High Wind Warning

Casper, Wyoming

6 AM

48°

Feels Like 37°

Humidity: 46%

UV Index: 0

Wind: 18 mph

7 AM

46°

Feels Like 34°

Humidity: 50%

UV Index: 0

Wind: 20 mph

8 AM

48°

Feels Like 43°

Humidity: 40%

UV Index: 1

Wind: 14 mph

9 AM

54°

Feels Like 48°

Humidity: 33%

UV Index: 2

Wind: 15 mph

10 AM

57°

Feels Like 54°

Humidity: 28%

UV Index: 3

Wind: 18 mph

11 AM

64°

Feels Like 63°

Humidity: 22%

UV Index: 4

Wind: 22 mph

12 PM

68°

Feels Like 66°

Humidity: 19%

UV Index: 5

Wind: 25 mph

1 PM

72°

Feels Like 70°

Humidity: 16%

UV Index: 5

Wind: 27 mph

2 PM

75°

Feels Like 72°

Humidity: 14%

UV Index: 5

Wind: 31 mph

3 PM

77°

Feels Like 73°

Humidity: 13%

UV Index: 4

Wind: 31 mph

4 PM

79°

Feels Like 75°

Humidity: 12%

UV Index: 3

Wind: 30 mph

5 PM

77°

Feels Like 73°

Humidity: 13%

UV Index: 2

Wind: 28 mph

6 PM

73°

Feels Like 70°

Humidity: 15%

UV Index: 1

Wind: 25 mph

7 PM

70°

Feels Like 66°

Humidity: 18%

UV Index: 0

Wind: 24 mph

8 PM

66°

Feels Like 63°

Humidity: 23%

UV Index: 0

Wind: 13 mph

9 PM

63°

Feels Like 59°

Humidity: 28%

UV Index: 0

Wind: 12 mph

10 PM

61°

Feels Like 55°

Humidity: 32%

UV Index: 0

Wind: 10 mph

11 PM

57°

Feels Like 54°

Humidity: 35%

UV Index: 0

Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

6 AM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1 µg/m³
PM₁₀: 2.61 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.1 ppb
CO: 0.09 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: 0.98 µg/m³
PM₁₀: 2.55 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.1 ppb
CO: 0.09 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: 0.99 µg/m³
PM₁₀: 2.55 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.1 ppb
CO: 0.09 ppm

Health Recommendations:

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

9 AM

38 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.99 µg/m³
PM₁₀: 2.55 µg/m³
O₃: 0.041 ppm
NO₂: 0.5 ppb
SO₂: 0.1 ppb
CO: 0.09 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:

PM_2.5: 0.98 µg/m³
PM₁₀: 2.52 µg/m³
O₃: 0.041 ppm
NO₂: 0.4 ppb
SO₂: 0.1 ppb
CO: 0.09 ppm

Health Recommendations:

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

11 AM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.99 µg/m³
PM₁₀: 2.48 µg/m³
O₃: 0.042 ppm
NO₂: 0.3 ppb
SO₂: 0.1 ppb
CO: 0.09 ppm

Health Recommendations:

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

12 PM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.02 µg/m³
PM₁₀: 2.48 µg/m³
O₃: 0.042 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

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.97 µg/m³
PM₁₀: 2.26 µg/m³
O₃: 0.044 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

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.96 µg/m³
PM₁₀: 2.16 µg/m³
O₃: 0.044 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.08 ppm

Health Recommendations:

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

3 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.97 µg/m³
PM₁₀: 2.18 µg/m³
O₃: 0.044 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

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

4 PM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1 µg/m³
PM₁₀: 2.32 µg/m³
O₃: 0.045 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

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

5 PM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.05 µg/m³
PM₁₀: 2.59 µg/m³
O₃: 0.046 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

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

6 PM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.05 µg/m³
PM₁₀: 2.82 µg/m³
O₃: 0.046 ppm
NO₂: 0.3 ppb
SO₂: 0.3 ppb
CO: 0.07 ppm

Health Recommendations:

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

7 PM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.06 µg/m³
PM₁₀: 2.95 µg/m³
O₃: 0.045 ppm
NO₂: 0.5 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

8 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.08 µg/m³
PM₁₀: 3.01 µg/m³
O₃: 0.045 ppm
NO₂: 0.7 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

9 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.11 µg/m³
PM₁₀: 3.08 µg/m³
O₃: 0.044 ppm
NO₂: 0.8 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

10 PM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.13 µg/m³
PM₁₀: 3.06 µg/m³
O₃: 0.042 ppm
NO₂: 0.9 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

11 PM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.19 µg/m³
PM₁₀: 3.09 µg/m³
O₃: 0.042 ppm
NO₂: 0.9 ppb
SO₂: 0.3 ppb
CO: 0.08 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 Casper

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued March 17 at 2:23AM MDT until March 21 at 9:00PM MDT by NWS Riverton WY

Mar 18, 12:00 PM → Mar 21, 9:00 PM

The National Weather Service in Riverton has issued a Fire Weather
Watch, which is in effect from Wednesday afternoon through
Saturday evening.

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

* AFFECTED AREA:
In Central WY Fire Zones...280...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 15 to 25 mph with gusts up to 40 mph. The strongest
wind is expected on Wednesday and Saturday.

* HUMIDITY: 10 to 15 percent.

* TEMPERATURES: Highs in the 70s Wednesday. Lows in 70s to around
80 Thursday through Saturday.

+ 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, 12:42 PM Source: NWS Alert

Severe Expected Likely

Red Flag Warning

Red Flag Warning issued March 18 at 1:55AM MDT until March 21 at 9:00PM MDT by NWS Riverton WY

Mar 18, 12:00 PM → Mar 21, 9:00 PM

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

* AFFECTED AREA:
In Central WY Fire Zones...280...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 45 mph today and
Saturday; 15 to 25 mph with gusts to 35 mph Thursday and Friday.

* HUMIDITY: 10 to 15 percent.

* TEMPERATURES: Highs 70 to 75 today, 75 to 80 Thursday through
Saturday.

+ 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, 4:54 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Casper

Fire Weather Watch

Red Flag Warning

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