Hourly Weather | Today Saturday, September 19, 2026
Fort Collins, Colorado
1 AM
Cloudy Night
55°
Feels Like 54°
27
Humidity: 93%
UV Index: 0
Wind: 6 mph
2 AM
Cloudy Night
55°
Feels Like 54°
13
Humidity: 96%
UV Index: 0
Wind: 5 mph
3 AM
Cloudy Night
54°
Feels Like 54°
13
Humidity: 97%
UV Index: 0
Wind: 5 mph
4 AM
Cloudy Night
54°
Feels Like 54°
13
Humidity: 98%
UV Index: 0
Wind: 5 mph
5 AM
Cloudy Night
54°
Feels Like 52°
13
Humidity: 98%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Weather
54°
Feels Like 52°
13
Humidity: 99%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
52°
Feels Like 50°
11
Humidity: 99%
UV Index: 0
Wind: 6 mph
8 AM
Cloudy Weather
54°
Feels Like 54°
7
Humidity: 98%
UV Index: 0
Wind: 6 mph
9 AM
Cloudy Weather
55°
Feels Like 57°
7
Humidity: 95%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
61°
Feels Like 61°
6
Humidity: 83%
UV Index: 2
Wind: 6 mph
11 AM
Cloudy Weather
63°
Feels Like 66°
5
Humidity: 75%
UV Index: 3
Wind: 7 mph
12 PM
Cloudy Weather
66°
Feels Like 68°
5
Humidity: 66%
UV Index: 3
Wind: 7 mph
1 PM
Cloudy Weather
68°
Feels Like 70°
8
Humidity: 57%
UV Index: 3
Wind: 7 mph
2 PM
Cloudy Weather
70°
Feels Like 73°
43
Humidity: 49%
UV Index: 4
Wind: 7 mph
3 PM
Cloudy Weather
73°
Feels Like 75°
47
Humidity: 43%
UV Index: 3
Wind: 7 mph
4 PM
Sunny with a Chance of Thunderstorms
72°
Feels Like 68°
51
Humidity: 49%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
70°
Feels Like 70°
19
Humidity: 52%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
70°
Feels Like 66°
15
Humidity: 54%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
66°
Feels Like 63°
19
Humidity: 56%
UV Index: 0
Wind: 7 mph
8 PM
Stormy Weather
63°
Feels Like 57°
51
Humidity: 65%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
61°
Feels Like 57°
47
Humidity: 71%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
57°
Feels Like 55°
40
Humidity: 77%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
57°
Feels Like 55°
34
Humidity: 81%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
17 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.17 µg/m³
  • PM10: 1.41 µg/m³
  • O3: 0.018 ppm
  • NO2: 2.7 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

2 AM
16 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.16 µg/m³
  • PM10: 1.35 µg/m³
  • O3: 0.017 ppm
  • NO2: 2.3 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

3 AM
15 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.02 µg/m³
  • PM10: 1.19 µg/m³
  • O3: 0.016 ppm
  • NO2: 2 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 1.13 µg/m³
  • O3: 0.015 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.95 µg/m³
  • PM10: 1.06 µg/m³
  • O3: 0.015 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.85 µg/m³
  • PM10: 0.96 µg/m³
  • O3: 0.014 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

7 AM
13 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.74 µg/m³
  • PM10: 0.87 µg/m³
  • O3: 0.014 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.69 µg/m³
  • PM10: 0.86 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

9 AM
13 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.7 µg/m³
  • PM10: 0.88 µg/m³
  • O3: 0.014 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.

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

Pollutant Concentrations:

  • PM2.5: 0.63 µg/m³
  • PM10: 0.92 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.07 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: 0.67 µg/m³
  • PM10: 1.05 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.74 µg/m³
  • PM10: 1.17 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.88 µg/m³
  • PM10: 1.46 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 1.68 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.11 µg/m³
  • PM10: 1.89 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.19 µg/m³
  • PM10: 2.1 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 2.25 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.16 µg/m³
  • PM10: 2.38 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.17 µg/m³
  • PM10: 2.41 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 2.44 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 2.5 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.18 µg/m³
  • PM10: 2.5 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.19 µg/m³
  • PM10: 2.53 µg/m³
  • O3: 0.022 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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