Hourly Weather | Today Tuesday, September 1, 2026
Great Falls, Montana
10 AM
Cloudy Weather
55°
Feels Like 63°
0
Humidity: 61%
UV Index: 3
Wind: 6 mph
11 AM
Sunny Weather
63°
Feels Like 70°
0
Humidity: 46%
UV Index: 4
Wind: 5 mph
12 PM
Cloudy Weather
68°
Feels Like 75°
0
Humidity: 36%
UV Index: 5
Wind: 5 mph
1 PM
Cloudy Weather
73°
Feels Like 81°
0
Humidity: 29%
UV Index: 5
Wind: 6 mph
2 PM
Cloudy Weather
81°
Feels Like 84°
0
Humidity: 23%
UV Index: 5
Wind: 6 mph
3 PM
Cloudy Weather
82°
Feels Like 86°
0
Humidity: 21%
UV Index: 4
Wind: 7 mph
4 PM
Cloudy Weather
84°
Feels Like 88°
0
Humidity: 19%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
82°
Feels Like 84°
0
Humidity: 20%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 20%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
81°
Feels Like 79°
0
Humidity: 23%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
77°
Feels Like 73°
0
Humidity: 26%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
73°
Feels Like 72°
0
Humidity: 30%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
70°
Feels Like 66°
0
Humidity: 33%
UV Index: 0
Wind: 9 mph
11 PM
Cloudy Night
66°
Feels Like 64°
0
Humidity: 38%
UV Index: 0
Wind: 10 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.09 µg/m³
  • PM10: 1.37 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.02 µg/m³
  • PM10: 1.31 µg/m³
  • O3: 0.038 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.

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

Pollutant Concentrations:

  • PM2.5: 1.11 µg/m³
  • PM10: 1.44 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.88 µg/m³
  • PM10: 2.38 µg/m³
  • O3: 0.049 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.

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

Pollutant Concentrations:

  • PM2.5: 2.15 µg/m³
  • PM10: 2.62 µg/m³
  • O3: 0.050 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.

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

Pollutant Concentrations:

  • PM2.5: 2.07 µg/m³
  • PM10: 2.51 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.98 µg/m³
  • PM10: 2.39 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.84 µg/m³
  • PM10: 2.22 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.06 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: 1.66 µg/m³
  • PM10: 2.01 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.2 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
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.49 µg/m³
  • PM10: 1.79 µg/m³
  • O3: 0.046 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.

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

Pollutant Concentrations:

  • PM2.5: 1.36 µg/m³
  • PM10: 1.62 µg/m³
  • O3: 0.042 ppm
  • NO2: 1 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
36 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.23 µg/m³
  • PM10: 1.46 µg/m³
  • O3: 0.039 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.

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

Pollutant Concentrations:

  • PM2.5: 1.06 µg/m³
  • PM10: 1.26 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.95 µg/m³
  • PM10: 1.12 µg/m³
  • O3: 0.034 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.