Hourly Weather | Today Tuesday, March 17, 2026
Greeley, Colorado
4 AM
Cloudy Night
30°
Feels Like 27°
0
Humidity: 71%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Night
30°
Feels Like 27°
0
Humidity: 70%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Night
32°
Feels Like 28°
0
Humidity: 69%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Night
34°
Feels Like 28°
0
Humidity: 69%
UV Index: 0
Wind: 7 mph
8 AM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 65%
UV Index: 1
Wind: 7 mph
9 AM
Cloudy Weather
43°
Feels Like 43°
0
Humidity: 56%
UV Index: 2
Wind: 8 mph
10 AM
Cloudy Weather
52°
Feels Like 52°
0
Humidity: 42%
UV Index: 3
Wind: 9 mph
11 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 32%
UV Index: 4
Wind: 13 mph
12 PM
Cloudy Weather
66°
Feels Like 68°
0
Humidity: 25%
UV Index: 5
Wind: 15 mph
1 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 22%
UV Index: 5
Wind: 15 mph
2 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 19%
UV Index: 5
Wind: 18 mph
3 PM
Cloudy Weather
75°
Feels Like 73°
0
Humidity: 18%
UV Index: 4
Wind: 20 mph
4 PM
Cloudy Weather
73°
Feels Like 72°
0
Humidity: 18%
UV Index: 3
Wind: 20 mph
5 PM
Cloudy Weather
73°
Feels Like 70°
0
Humidity: 18%
UV Index: 2
Wind: 20 mph
6 PM
Cloudy Weather
70°
Feels Like 66°
0
Humidity: 20%
UV Index: 1
Wind: 20 mph
7 PM
Cloudy Weather
64°
Feels Like 61°
0
Humidity: 25%
UV Index: 0
Wind: 17 mph
8 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 29%
UV Index: 0
Wind: 12 mph
9 PM
Cloudy Night
57°
Feels Like 52°
0
Humidity: 32%
UV Index: 0
Wind: 10 mph
10 PM
Cloudy Night
54°
Feels Like 48°
0
Humidity: 35%
UV Index: 0
Wind: 10 mph
11 PM
Cloudy Night
52°
Feels Like 45°
0
Humidity: 40%
UV Index: 0
Wind: 10 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.56 µg/m³
  • PM10: 0.79 µg/m³
  • O3: 0.030 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.

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

Pollutant Concentrations:

  • PM2.5: 0.54 µg/m³
  • PM10: 0.73 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.53 µg/m³
  • PM10: 0.68 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.6 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
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.55 µg/m³
  • PM10: 0.67 µg/m³
  • O3: 0.026 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.

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

Pollutant Concentrations:

  • PM2.5: 0.65 µg/m³
  • PM10: 0.83 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.3 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
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.82 µg/m³
  • PM10: 1.09 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1.29 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1 µg/m³
  • PM10: 1.39 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 1.41 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.63 µg/m³
  • PM10: 0.88 µg/m³
  • O3: 0.036 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.

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

Pollutant Concentrations:

  • PM2.5: 0.62 µg/m³
  • PM10: 0.83 µg/m³
  • O3: 0.038 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.

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

Pollutant Concentrations:

  • PM2.5: 0.65 µg/m³
  • PM10: 0.84 µg/m³
  • O3: 0.039 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.

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

Pollutant Concentrations:

  • PM2.5: 0.7 µg/m³
  • PM10: 0.89 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.3 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
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.75 µg/m³
  • PM10: 0.98 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.75 µg/m³
  • PM10: 1.01 µg/m³
  • O3: 0.039 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.

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

Pollutant Concentrations:

  • PM2.5: 0.85 µg/m³
  • PM10: 1.25 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.07 µg/m³
  • PM10: 1.76 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.27 µg/m³
  • PM10: 2.3 µg/m³
  • O3: 0.033 ppm
  • NO2: 4 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 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: 1.4 µg/m³
  • PM10: 2.68 µg/m³
  • O3: 0.033 ppm
  • NO2: 4.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.48 µg/m³
  • PM10: 2.9 µg/m³
  • O3: 0.032 ppm
  • NO2: 3.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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