Hourly Weather | Today Tuesday, July 21, 2026
Great Falls, Montana
2 AM
Rainy Weather
64°
Feels Like 61°
51
Humidity: 63%
UV Index: 0
Wind: 9 mph
3 AM
Cloudy Weather
64°
Feels Like 61°
44
Humidity: 62%
UV Index: 0
Wind: 9 mph
4 AM
Cloudy Weather
63°
Feels Like 61°
36
Humidity: 63%
UV Index: 0
Wind: 8 mph
5 AM
Cloudy Night
61°
Feels Like 59°
34
Humidity: 65%
UV Index: 0
Wind: 7 mph
6 AM
Cloudy Weather
59°
Feels Like 57°
34
Humidity: 70%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
61°
Feels Like 63°
22
Humidity: 67%
UV Index: 1
Wind: 5 mph
8 AM
Cloudy Weather
63°
Feels Like 66°
0
Humidity: 66%
UV Index: 2
Wind: 5 mph
9 AM
Cloudy Weather
66°
Feels Like 70°
0
Humidity: 62%
UV Index: 3
Wind: 5 mph
10 AM
Cloudy Weather
70°
Feels Like 73°
0
Humidity: 57%
UV Index: 5
Wind: 6 mph
11 AM
Cloudy Weather
72°
Feels Like 79°
0
Humidity: 52%
UV Index: 6
Wind: 7 mph
12 PM
Cloudy Weather
73°
Feels Like 81°
0
Humidity: 48%
UV Index: 8
Wind: 8 mph
1 PM
Cloudy Weather
77°
Feels Like 84°
0
Humidity: 43%
UV Index: 9
Wind: 8 mph
2 PM
Cloudy Weather
81°
Feels Like 84°
0
Humidity: 38%
UV Index: 8
Wind: 8 mph
3 PM
Cloudy Weather
81°
Feels Like 84°
0
Humidity: 36%
UV Index: 6
Wind: 9 mph
4 PM
Cloudy Weather
82°
Feels Like 84°
0
Humidity: 35%
UV Index: 5
Wind: 10 mph
5 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 33%
UV Index: 3
Wind: 10 mph
6 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 35%
UV Index: 2
Wind: 12 mph
7 PM
Cloudy Weather
82°
Feels Like 81°
0
Humidity: 37%
UV Index: 1
Wind: 13 mph
8 PM
Cloudy Weather
81°
Feels Like 77°
0
Humidity: 41%
UV Index: 0
Wind: 13 mph
9 PM
Cloudy Weather
77°
Feels Like 73°
0
Humidity: 46%
UV Index: 0
Wind: 12 mph
10 PM
Cloudy Weather
75°
Feels Like 72°
0
Humidity: 50%
UV Index: 0
Wind: 10 mph
11 PM
Cloudy Weather
72°
Feels Like 70°
0
Humidity: 54%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

2 AM
48 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.41 µg/m³
  • PM10: 12.56 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

3 AM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.24 µg/m³
  • PM10: 12.49 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

4 AM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.73 µg/m³
  • PM10: 12.01 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 AM
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.21 µg/m³
  • PM10: 11.48 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

6 AM
41 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.88 µg/m³
  • PM10: 11.16 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

7 AM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.69 µg/m³
  • PM10: 10.99 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

8 AM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.55 µg/m³
  • PM10: 10.89 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

9 AM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.49 µg/m³
  • PM10: 10.87 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

10 AM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.24 µg/m³
  • PM10: 13.01 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

11 AM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.08 µg/m³
  • PM10: 13.94 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

12 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.58 µg/m³
  • PM10: 14.46 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

1 PM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.62 µg/m³
  • PM10: 15.54 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.13 µg/m³
  • PM10: 16 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.22 µg/m³
  • PM10: 16.06 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.01 µg/m³
  • PM10: 15.69 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.42 µg/m³
  • PM10: 14.94 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.9 µg/m³
  • PM10: 14.36 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.37 µg/m³
  • PM10: 13.78 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.82 µg/m³
  • PM10: 13.18 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

9 PM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.2 µg/m³
  • PM10: 12.51 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

10 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.77 µg/m³
  • PM10: 12.03 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

11 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.63 µg/m³
  • PM10: 11.87 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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