Hourly Weather | Today Tuesday, September 1, 2026
Helena, Montana
10 AM
Cloudy Weather
57°
Feels Like 64°
37
Humidity: 56%
UV Index: 3
Wind: 4 mph
11 AM
Cloudy Weather
63°
Feels Like 70°
14
Humidity: 44%
UV Index: 4
Wind: 6 mph
12 PM
Cloudy Weather
68°
Feels Like 72°
14
Humidity: 36%
UV Index: 4
Wind: 6 mph
1 PM
Cloudy Weather
73°
Feels Like 77°
9
Humidity: 31%
UV Index: 4
Wind: 7 mph
2 PM
Cloudy Weather
77°
Feels Like 81°
0
Humidity: 27%
UV Index: 4
Wind: 7 mph
3 PM
Cloudy Weather
81°
Feels Like 82°
0
Humidity: 23%
UV Index: 4
Wind: 8 mph
4 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 21%
UV Index: 3
Wind: 9 mph
5 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 20%
UV Index: 2
Wind: 11 mph
6 PM
Cloudy Weather
82°
Feels Like 81°
0
Humidity: 21%
UV Index: 1
Wind: 11 mph
7 PM
Cloudy Weather
81°
Feels Like 77°
0
Humidity: 24%
UV Index: 0
Wind: 11 mph
8 PM
Cloudy Weather
77°
Feels Like 73°
1
Humidity: 28%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
73°
Feels Like 70°
1
Humidity: 34%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
70°
Feels Like 68°
1
Humidity: 40%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
66°
Feels Like 64°
1
Humidity: 47%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.2 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
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.47 µg/m³
  • PM10: 2.1 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.53 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.036 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.

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

Pollutant Concentrations:

  • PM2.5: 1.59 µg/m³
  • PM10: 2.08 µg/m³
  • O3: 0.043 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.

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

Pollutant Concentrations:

  • PM2.5: 1.49 µg/m³
  • PM10: 1.84 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.33 µg/m³
  • PM10: 1.6 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.1 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
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.16 µg/m³
  • PM10: 1.37 µg/m³
  • O3: 0.045 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
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.94 µg/m³
  • PM10: 1.1 µg/m³
  • O3: 0.044 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
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.74 µg/m³
  • PM10: 0.85 µg/m³
  • O3: 0.044 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
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.59 µg/m³
  • PM10: 0.67 µg/m³
  • O3: 0.042 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
36 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.51 µg/m³
  • PM10: 0.56 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.8 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
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.52 µg/m³
  • O3: 0.037 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.

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.033 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.

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.51 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.07 ppm

Health Recommendations:

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