Hourly Weather | Today Wednesday, August 12, 2026
Decatur, Illinois
8 AM
Stormy Weather
79°
Feels Like 79°
65
Humidity: 85%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
81°
Feels Like 90°
49
Humidity: 81%
UV Index: 3
Wind: 9 mph
10 AM
Cloudy Weather
82°
Feels Like 93°
49
Humidity: 76%
UV Index: 4
Wind: 10 mph
11 AM
Cloudy Weather
84°
Feels Like 99°
48
Humidity: 72%
UV Index: 6
Wind: 10 mph
12 PM
Cloudy Weather
90°
Feels Like 102°
49
Humidity: 63%
UV Index: 8
Wind: 10 mph
1 PM
Sunny with a Chance of Thunderstorms
88°
Feels Like 99°
56
Humidity: 75%
UV Index: 7
Wind: 10 mph
2 PM
Sunny with a Chance of Thunderstorms
84°
Feels Like 93°
65
Humidity: 82%
UV Index: 3
Wind: 10 mph
3 PM
Cloudy Weather
84°
Feels Like 97°
49
Humidity: 72%
UV Index: 4
Wind: 9 mph
4 PM
Sunny with a Chance of Thunderstorms
82°
Feels Like 90°
65
Humidity: 85%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
84°
Feels Like 93°
40
Humidity: 74%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
82°
Feels Like 90°
34
Humidity: 78%
UV Index: 2
Wind: 10 mph
7 PM
Cloudy Weather
81°
Feels Like 88°
34
Humidity: 82%
UV Index: 1
Wind: 10 mph
8 PM
Cloudy Night
79°
Feels Like 84°
34
Humidity: 87%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
75°
Feels Like 81°
34
Humidity: 94%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
75°
Feels Like 81°
40
Humidity: 94%
UV Index: 0
Wind: 8 mph
11 PM
Stormy Weather
73°
Feels Like 73°
51
Humidity: 95%
UV Index: 0
Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.46 µg/m³
  • PM10: 4.99 µg/m³
  • O3: 0.015 ppm
  • NO2: 3 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.48 µg/m³
  • PM10: 4.97 µg/m³
  • O3: 0.013 ppm
  • NO2: 2.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.57 µg/m³
  • PM10: 5.03 µg/m³
  • O3: 0.015 ppm
  • NO2: 2.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.95 µg/m³
  • PM10: 5.4 µg/m³
  • O3: 0.022 ppm
  • NO2: 2 ppb
  • SO2: 1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.8 µg/m³
  • PM10: 6.27 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.4 ppb
  • SO2: 1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.68 µg/m³
  • PM10: 7.14 µg/m³
  • O3: 0.039 ppm
  • NO2: 1 ppb
  • SO2: 1.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.59 µg/m³
  • PM10: 7.04 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.58 µg/m³
  • PM10: 7.04 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.51 µg/m³
  • PM10: 7 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.8 ppb
  • SO2: 1.4 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.52 µg/m³
  • PM10: 7.05 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.1 ppb
  • SO2: 1.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.36 µg/m³
  • PM10: 6.95 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.8 ppb
  • SO2: 1.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.87 µg/m³
  • PM10: 6.52 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.5 ppb
  • SO2: 1.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.22 µg/m³
  • PM10: 5.92 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.9 ppb
  • SO2: 1.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.54 µg/m³
  • PM10: 5.27 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.9 ppb
  • SO2: 1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.88 µg/m³
  • PM10: 4.64 µg/m³
  • O3: 0.027 ppm
  • NO2: 2.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.32 µg/m³
  • PM10: 4.07 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.10 ppm

Health Recommendations:

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