Hourly Weather Forecast for Gillette, Wyoming

Hourly Weather | Today › Wednesday, March 18, 2026

Active Weather Warnings

Red Flag Warning

Gillette, Wyoming

6 AM

43°

Feels Like 37°

Humidity: 64%

UV Index: 0

Wind: 9 mph

7 AM

45°

Feels Like 39°

Humidity: 61%

UV Index: 0

Wind: 9 mph

8 AM

46°

Feels Like 37°

Humidity: 59%

UV Index: 1

Wind: 12 mph

9 AM

50°

Feels Like 45°

Humidity: 52%

UV Index: 1

Wind: 14 mph

10 AM

57°

Feels Like 52°

Humidity: 41%

UV Index: 2

Wind: 14 mph

11 AM

63°

Feels Like 61°

Humidity: 32%

UV Index: 3

Wind: 15 mph

12 PM

66°

Feels Like 66°

Humidity: 27%

UV Index: 4

Wind: 16 mph

1 PM

70°

Feels Like 70°

Humidity: 22%

UV Index: 4

Wind: 17 mph

2 PM

72°

Feels Like 72°

Humidity: 19%

UV Index: 4

Wind: 16 mph

3 PM

73°

Feels Like 72°

Humidity: 17%

UV Index: 3

Wind: 17 mph

4 PM

75°

Feels Like 73°

Humidity: 16%

UV Index: 2

Wind: 16 mph

5 PM

72°

Feels Like 70°

Humidity: 17%

UV Index: 2

Wind: 15 mph

6 PM

68°

Feels Like 66°

Humidity: 19%

UV Index: 1

Wind: 14 mph

7 PM

63°

Feels Like 59°

Humidity: 25%

UV Index: 0

Wind: 12 mph

8 PM

55°

Feels Like 52°

Humidity: 32%

UV Index: 0

Wind: 9 mph

9 PM

54°

Feels Like 50°

Humidity: 36%

UV Index: 0

Wind: 8 mph

10 PM

50°

Feels Like 46°

Humidity: 40%

UV Index: 0

Wind: 8 mph

11 PM

48°

Feels Like 45°

Humidity: 43%

UV Index: 0

Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

6 AM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.41 µg/m³
PM₁₀: 3.51 µg/m³
O₃: 0.040 ppm
NO₂: 0.4 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

7 AM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.49 µg/m³
PM₁₀: 3.67 µg/m³
O₃: 0.039 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

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.45 µg/m³
PM₁₀: 3.64 µg/m³
O₃: 0.039 ppm
NO₂: 0.6 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

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.33 µg/m³
PM₁₀: 3.44 µg/m³
O₃: 0.039 ppm
NO₂: 0.6 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: 1.18 µg/m³
PM₁₀: 3.14 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.

11 AM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.12 µg/m³
PM₁₀: 3 µg/m³
O₃: 0.043 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.

12 PM

42 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.1 µg/m³
PM₁₀: 2.9 µg/m³
O₃: 0.045 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.

1 PM

44 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.93 µg/m³
PM₁₀: 2.38 µg/m³
O₃: 0.048 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

2 PM

45 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.78 µg/m³
PM₁₀: 2.02 µg/m³
O₃: 0.048 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

3 PM

45 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.66 µg/m³
PM₁₀: 1.77 µg/m³
O₃: 0.048 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.08 ppm

Health Recommendations:

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

4 PM

44 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.57 µg/m³
PM₁₀: 1.56 µg/m³
O₃: 0.048 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.08 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:

PM_2.5: 0.5 µg/m³
PM₁₀: 1.32 µg/m³
O₃: 0.047 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.08 ppm

Health Recommendations:

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

6 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.5 µg/m³
PM₁₀: 1.33 µg/m³
O₃: 0.047 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.08 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:

PM_2.5: 0.51 µg/m³
PM₁₀: 1.49 µg/m³
O₃: 0.047 ppm
NO₂: 0.4 ppb
SO₂: 0 ppb
CO: 0.08 ppm

Health Recommendations:

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

8 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.61 µg/m³
PM₁₀: 1.91 µg/m³
O₃: 0.047 ppm
NO₂: 0.5 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

9 PM

44 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.73 µg/m³
PM₁₀: 2.3 µg/m³
O₃: 0.047 ppm
NO₂: 0.5 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

10 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.83 µg/m³
PM₁₀: 2.56 µg/m³
O₃: 0.046 ppm
NO₂: 0.6 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

11 PM

41 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.93 µg/m³
PM₁₀: 2.85 µg/m³
O₃: 0.044 ppm
NO₂: 0.6 ppb
SO₂: 0 ppb
CO: 0.09 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 Gillette

Severe Expected Likely

Red Flag Warning

Red Flag Warning issued March 17 at 9:23PM MDT until March 18 at 7:00PM MDT by NWS Rapid City SD

Mar 18, 10:00 AM → Mar 18, 7:00 PM

...CRITICAL FIRE WEATHER CONDITIONS WEDNESDAY ACROSS PORTIONS OF
NORTHEASTERN WYOMING AND FAR SOUTHWESTERN SOUTH DAKOTA...

.Very warm temperatures Wednesday with highs in the upper 60s into
mid 70s across northeastern Wyoming and southwestern South Dakota.
These anomalously warm temperatures coupled with gusty west-northwest
winds (gusts 25 to 40 mph) and relative humidity falling to
around 15 percent will result in critical fire weather conditions
Wednesday afternoon and early evening.

The National Weather Service in Rapid City has issued a Red Flag
Warning for gusty winds and low relative humidity, which is in
effect from 10 AM to 7 PM MDT Wednesday.

* AFFECTED AREA...Fire Weather Zones 314 Northern Campbell, 321
Southern Black Hills, 325 Custer County Plains and 326 Pine
Ridge Area.

* WINDS...West-northwest 10 to 20 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 15 percent.

IMPACTS: The combination of gusty winds and low relative
humidity will produce critical fire weather conditions.

IMPACTS: The combination of gusty winds and low relative
humidity would produce critical fire weather conditions.

+ 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, 3:44 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Gillette

Red Flag Warning

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