Hourly Weather | Today Wednesday, May 20, 2026
Thornton, Colorado
4 PM
Stormy Weather
57°
Feels Like 57°
56
Humidity: 61%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
61°
Feels Like 61°
49
Humidity: 54%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
57°
Feels Like 57°
48
Humidity: 57%
UV Index: 1
Wind: 7 mph
7 PM
Sunny with a Chance of Thunderstorms
55°
Feels Like 52°
52
Humidity: 66%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
54°
Feels Like 52°
40
Humidity: 73%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
52°
Feels Like 48°
34
Humidity: 79%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
48°
Feels Like 46°
34
Humidity: 83%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
48°
Feels Like 45°
35
Humidity: 85%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.76 µg/m³
  • PM10: 1.38 µg/m³
  • O3: 0.045 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
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.85 µg/m³
  • PM10: 1.63 µg/m³
  • O3: 0.046 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
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1.92 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.1 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 PM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 1.86 µg/m³
  • O3: 0.046 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
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1 µg/m³
  • PM10: 1.7 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.9 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
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.02 µg/m³
  • PM10: 1.64 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.2 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.03 µg/m³
  • PM10: 1.61 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.04 µg/m³
  • PM10: 1.54 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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