Hourly Weather | Today Tuesday, July 21, 2026
Helena, Montana
2 AM
Night
66°
Feels Like 64°
7
Humidity: 55%
UV Index: 0
Wind: 7 mph
3 AM
Night
64°
Feels Like 63°
7
Humidity: 59%
UV Index: 0
Wind: 6 mph
4 AM
Cloudy Night
64°
Feels Like 63°
7
Humidity: 63%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Night
63°
Feels Like 61°
7
Humidity: 66%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Weather
61°
Feels Like 61°
7
Humidity: 71%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
59°
Feels Like 61°
5
Humidity: 76%
UV Index: 1
Wind: 4 mph
8 AM
Cloudy Weather
63°
Feels Like 66°
0
Humidity: 70%
UV Index: 2
Wind: 4 mph
9 AM
Cloudy Weather
66°
Feels Like 70°
0
Humidity: 63%
UV Index: 3
Wind: 4 mph
10 AM
Cloudy Weather
70°
Feels Like 75°
0
Humidity: 57%
UV Index: 5
Wind: 4 mph
11 AM
Cloudy Weather
72°
Feels Like 81°
0
Humidity: 51%
UV Index: 7
Wind: 6 mph
12 PM
Cloudy Weather
75°
Feels Like 84°
0
Humidity: 46%
UV Index: 8
Wind: 6 mph
1 PM
Cloudy Weather
79°
Feels Like 86°
0
Humidity: 41%
UV Index: 9
Wind: 7 mph
2 PM
Cloudy Weather
81°
Feels Like 88°
0
Humidity: 37%
UV Index: 8
Wind: 8 mph
3 PM
Cloudy Weather
82°
Feels Like 88°
0
Humidity: 35%
UV Index: 7
Wind: 8 mph
4 PM
Cloudy Weather
84°
Feels Like 86°
0
Humidity: 33%
UV Index: 5
Wind: 9 mph
5 PM
Cloudy Weather
86°
Feels Like 86°
0
Humidity: 31%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
86°
Feels Like 84°
0
Humidity: 32%
UV Index: 2
Wind: 9 mph
7 PM
Cloudy Weather
84°
Feels Like 82°
0
Humidity: 34%
UV Index: 1
Wind: 8 mph
8 PM
Cloudy Weather
81°
Feels Like 79°
0
Humidity: 38%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Weather
79°
Feels Like 77°
0
Humidity: 43%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Weather
77°
Feels Like 73°
0
Humidity: 47%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Weather
73°
Feels Like 72°
0
Humidity: 52%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

2 AM
70 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 21.26 µg/m³
  • PM10: 21.48 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

3 AM
69 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.87 µg/m³
  • PM10: 21.09 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

4 AM
68 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.39 µg/m³
  • PM10: 20.62 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

5 AM
67 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.15 µg/m³
  • PM10: 20.42 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

6 AM
67 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.02 µg/m³
  • PM10: 20.32 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

7 AM
66 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 19.66 µg/m³
  • PM10: 20.01 µg/m³
  • O3: 0.031 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

8 AM
66 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 19.3 µg/m³
  • PM10: 19.71 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.8 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

9 AM
65 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 19.01 µg/m³
  • PM10: 19.47 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.2 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

10 AM
59 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.34 µg/m³
  • PM10: 16.94 µg/m³
  • O3: 0.044 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

11 AM
58 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.67 µg/m³
  • PM10: 16.23 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.9 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.

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

Pollutant Concentrations:

  • PM2.5: 15.31 µg/m³
  • PM10: 15.86 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.7 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.

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

Pollutant Concentrations:

  • PM2.5: 15.15 µg/m³
  • PM10: 15.68 µg/m³
  • O3: 0.047 ppm
  • NO2: 1.3 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
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.64 µg/m³
  • PM10: 15.17 µg/m³
  • O3: 0.048 ppm
  • NO2: 1 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: 14.52 µg/m³
  • PM10: 15.08 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.35 µg/m³
  • PM10: 15.06 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 PM
58 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 14.22 µg/m³
  • PM10: 14.93 µg/m³
  • O3: 0.057 ppm
  • NO2: 0.5 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
55 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 13.65 µg/m³
  • PM10: 14.32 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.6 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
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.86 µg/m³
  • PM10: 13.45 µg/m³
  • O3: 0.051 ppm
  • NO2: 1 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
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.26 µg/m³
  • PM10: 12.76 µg/m³
  • O3: 0.044 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.02 µg/m³
  • PM10: 12.47 µg/m³
  • O3: 0.039 ppm
  • NO2: 2 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
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.84 µg/m³
  • PM10: 12.27 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.2 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
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.75 µg/m³
  • PM10: 12.17 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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