Hourly Weather | Today Tuesday, June 9, 2026
Active Weather Warnings
Thornton, Colorado
6 PM
Rainy Weather
86°
Feels Like 82°
40
Humidity: 18%
UV Index: 1
Wind: 13 mph
7 PM
Cloudy Weather
84°
Feels Like 81°
37
Humidity: 17%
UV Index: 1
Wind: 12 mph
8 PM
Cloudy Weather
82°
Feels Like 79°
2
Humidity: 16%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
79°
Feels Like 75°
2
Humidity: 17%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
75°
Feels Like 72°
2
Humidity: 19%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
72°
Feels Like 70°
2
Humidity: 22%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.49 µg/m³
  • PM10: 2.82 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.56 µg/m³
  • PM10: 3.02 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.06 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:

  • PM2.5: 1.61 µg/m³
  • PM10: 3.09 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 3.1 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.61 µg/m³
  • PM10: 3.01 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.64 µg/m³
  • PM10: 2.97 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.5 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Thornton

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued June 8 at 2:32AM MDT until June 9 at 9:00PM MDT by NWS Denver CO
Jun 9, 12:00 PM Jun 9, 9:00 PM
* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242,
243, 244, 245, 246, 247, 248, 249, 250 and 251.

* TIMING...From Tuesday afternoon through Tuesday evening.

* WINDS...Southwest 20 to 30 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 8 percent.

IMPACTS: Conditions will be favorable for rapid fire spread.
Avoid outdoor burning and any activity that may produce a
spark and start a wildfire.
+ 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: Jun 8, 12:48 PM Source: NWS Alert
Severe Expected Likely

Red Flag Warning

Red Flag Warning issued June 9 at 12:57PM MDT until June 9 at 9:00PM MDT by NWS Denver CO
Jun 9, 12:57 PM Jun 9, 9:00 PM
The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon to 8 PM MDT Wednesday. The Fire Weather Watch is no
longer in effect.

* AFFECTED AREA...Fire Weather Zones 240, 241, 242, 243, 244,
245, 248, 250 and 251.

* TIMING...For the first Red Flag Warning, until 9 PM MDT this
evening. For the second Red Flag Warning, from noon to 8 PM
MDT Wednesday.

* WINDS...West 15 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 11 percent.

IMPACTS: Conditions will be favorable for rapid fire spread.
Avoid outdoor burning and any activity that may produce a
spark and start a wildfire.
+ 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: Jun 9, 5:40 PM Source: NWS Alert