Hourly Weather | Today Wednesday, March 18, 2026
McKinney, Texas
4 AM
Cloudy Night
48°
Feels Like 39°
0
Humidity: 48%
UV Index: 0
Wind: 16 mph
5 AM
Cloudy Night
48°
Feels Like 39°
0
Humidity: 52%
UV Index: 0
Wind: 15 mph
6 AM
Cloudy Night
46°
Feels Like 37°
0
Humidity: 55%
UV Index: 0
Wind: 15 mph
7 AM
Cloudy Night
46°
Feels Like 36°
0
Humidity: 62%
UV Index: 0
Wind: 14 mph
8 AM
Cloudy Weather
46°
Feels Like 39°
0
Humidity: 62%
UV Index: 1
Wind: 14 mph
9 AM
Cloudy Weather
48°
Feels Like 43°
0
Humidity: 59%
UV Index: 2
Wind: 15 mph
10 AM
Cloudy Weather
54°
Feels Like 50°
0
Humidity: 51%
UV Index: 3
Wind: 16 mph
11 AM
Cloudy Weather
57°
Feels Like 55°
0
Humidity: 44%
UV Index: 5
Wind: 16 mph
12 PM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 39%
UV Index: 6
Wind: 16 mph
1 PM
Cloudy Weather
66°
Feels Like 68°
0
Humidity: 37%
UV Index: 6
Wind: 16 mph
2 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 35%
UV Index: 6
Wind: 17 mph
3 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 34%
UV Index: 5
Wind: 16 mph
4 PM
Cloudy Weather
73°
Feels Like 72°
0
Humidity: 32%
UV Index: 3
Wind: 16 mph
5 PM
Cloudy Weather
75°
Feels Like 73°
0
Humidity: 31%
UV Index: 2
Wind: 15 mph
6 PM
Cloudy Weather
73°
Feels Like 72°
0
Humidity: 34%
UV Index: 1
Wind: 13 mph
7 PM
Cloudy Weather
72°
Feels Like 68°
0
Humidity: 38%
UV Index: 0
Wind: 12 mph
8 PM
Cloudy Night
68°
Feels Like 64°
0
Humidity: 45%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
64°
Feels Like 63°
0
Humidity: 49%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 54%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 59%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 AM
61 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 4.8 µg/m³
  • O3: 0.057 ppm
  • NO2: 1 ppb
  • SO2: 0.5 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
57 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.85 µg/m³
  • PM10: 4.95 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.9 ppb
  • SO2: 0.4 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
54 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.88 µg/m³
  • PM10: 5.01 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.9 ppb
  • SO2: 0.4 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
52 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.83 µg/m³
  • PM10: 5.03 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.9 ppb
  • SO2: 0.3 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
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.67 µg/m³
  • PM10: 4.98 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.25 µg/m³
  • PM10: 4.76 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.99 µg/m³
  • PM10: 4.79 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

11 AM
56 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.08 µg/m³
  • PM10: 5.41 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.9 ppb
  • SO2: 0.3 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
61 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.35 µg/m³
  • PM10: 6.06 µg/m³
  • O3: 0.058 ppm
  • NO2: 0.6 ppb
  • SO2: 0.3 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
65 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.87 µg/m³
  • PM10: 6.87 µg/m³
  • O3: 0.059 ppm
  • NO2: 0.5 ppb
  • SO2: 0.3 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
72 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.44 µg/m³
  • PM10: 7.84 µg/m³
  • O3: 0.061 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 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
74 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.72 µg/m³
  • PM10: 8.35 µg/m³
  • O3: 0.062 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 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
73 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.9 µg/m³
  • PM10: 8.65 µg/m³
  • O3: 0.061 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 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
72 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.19 µg/m³
  • PM10: 9.06 µg/m³
  • O3: 0.061 ppm
  • NO2: 0.5 ppb
  • SO2: 0.3 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
65 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.43 µg/m³
  • PM10: 9.36 µg/m³
  • O3: 0.059 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 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
57 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.57 µg/m³
  • PM10: 9.57 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.3 ppb
  • SO2: 0.3 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 PM
50 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.73 µg/m³
  • PM10: 9.82 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.94 µg/m³
  • PM10: 10.15 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.17 µg/m³
  • PM10: 10.45 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.24 µg/m³
  • PM10: 10.52 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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