Hourly Weather | Today Thursday, January 15, 2026
Decatur, Illinois
2 AM
Cloudy Night
19°
Feels Like
0
Humidity: 59%
Wind: 18 mph
UV Index: 0
3 AM
Cloudy Night
19°
Feels Like
0
Humidity: 57%
Wind: 18 mph
UV Index: 0
4 AM
Cloudy Night
19°
Feels Like
0
Humidity: 59%
Wind: 17 mph
UV Index: 0
5 AM
Cloudy Night
18°
Feels Like
0
Humidity: 60%
Wind: 17 mph
UV Index: 0
6 AM
Cloudy Night
18°
Feels Like
0
Humidity: 62%
Wind: 16 mph
UV Index: 0
7 AM
Night
18°
Feels Like
0
Humidity: 65%
Wind: 9 mph
UV Index: 0
8 AM
Sunny Weather
16°
Feels Like
0
Humidity: 66%
Wind: 9 mph
UV Index: 1
9 AM
Sunny Weather
18°
Feels Like 10°
0
Humidity: 60%
Wind: 9 mph
UV Index: 1
10 AM
Sunny Weather
21°
Feels Like 16°
0
Humidity: 54%
Wind: 9 mph
UV Index: 2
11 AM
Sunny Weather
23°
Feels Like 19°
0
Humidity: 48%
Wind: 8 mph
UV Index: 2
12 PM
Sunny Weather
25°
Feels Like 21°
0
Humidity: 44%
Wind: 8 mph
UV Index: 2
1 PM
Sunny Weather
27°
Feels Like 25°
0
Humidity: 41%
Wind: 8 mph
UV Index: 2
2 PM
Sunny Weather
28°
Feels Like 23°
0
Humidity: 38%
Wind: 9 mph
UV Index: 2
3 PM
Cloudy Weather
28°
Feels Like 23°
0
Humidity: 36%
Wind: 9 mph
UV Index: 1
4 PM
Cloudy Weather
28°
Feels Like 21°
0
Humidity: 38%
Wind: 9 mph
UV Index: 1
5 PM
Cloudy Night
27°
Feels Like 19°
0
Humidity: 43%
Wind: 8 mph
UV Index: 0
6 PM
Cloudy Weather
27°
Feels Like 21°
2
Humidity: 46%
Wind: 7 mph
UV Index: 0
7 PM
Cloudy Weather
27°
Feels Like 19°
41
Humidity: 48%
Wind: 8 mph
UV Index: 0
8 PM
Snowy Weather
28°
Feels Like 18°
44
Humidity: 47%
Wind: 10 mph
UV Index: 0
9 PM
Snowy Weather
28°
Feels Like 16°
44
Humidity: 48%
Wind: 12 mph
UV Index: 0
10 PM
Cloudy Weather
28°
Feels Like 18°
38
Humidity: 53%
Wind: 12 mph
UV Index: 0
11 PM
Snowy Weather
28°
Feels Like 16°
45
Humidity: 60%
Wind: 13 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.38 µg/m³
  • PM10: 1.77 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.53 µg/m³
  • PM10: 1.93 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.66 µg/m³
  • PM10: 2.07 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.3 ppb
  • SO2: 1.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.8 µg/m³
  • PM10: 2.23 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.3 ppb
  • SO2: 1.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

6 AM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.92 µg/m³
  • PM10: 2.37 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.4 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

7 AM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.02 µg/m³
  • PM10: 2.52 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.7 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 AM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.09 µg/m³
  • PM10: 2.63 µg/m³
  • O3: 0.035 ppm
  • NO2: 3 ppb
  • SO2: 1.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.09 µg/m³
  • PM10: 2.66 µg/m³
  • O3: 0.036 ppm
  • NO2: 3.2 ppb
  • SO2: 1.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.04 µg/m³
  • PM10: 2.61 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.9 ppb
  • SO2: 2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.04 µg/m³
  • PM10: 2.63 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.7 ppb
  • SO2: 2.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.19 µg/m³
  • PM10: 2.82 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.6 ppb
  • SO2: 2.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.41 µg/m³
  • PM10: 3.09 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.7 ppb
  • SO2: 2.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.49 µg/m³
  • PM10: 3.23 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.9 ppb
  • SO2: 2.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.56 µg/m³
  • PM10: 3.39 µg/m³
  • O3: 0.038 ppm
  • NO2: 3.5 ppb
  • SO2: 2.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.78 µg/m³
  • PM10: 3.77 µg/m³
  • O3: 0.037 ppm
  • NO2: 4.8 ppb
  • SO2: 2.9 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.18 µg/m³
  • PM10: 4.36 µg/m³
  • O3: 0.034 ppm
  • NO2: 6.4 ppb
  • SO2: 3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.6 µg/m³
  • PM10: 4.96 µg/m³
  • O3: 0.032 ppm
  • NO2: 7.6 ppb
  • SO2: 3.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.89 µg/m³
  • PM10: 5.35 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.1 ppb
  • SO2: 3.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.87 µg/m³
  • PM10: 5.34 µg/m³
  • O3: 0.030 ppm
  • NO2: 7.7 ppb
  • SO2: 3.1 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.43 µg/m³
  • PM10: 4.77 µg/m³
  • O3: 0.031 ppm
  • NO2: 6.3 ppb
  • SO2: 2.5 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.93 µg/m³
  • PM10: 3.84 µg/m³
  • O3: 0.035 ppm
  • NO2: 4.4 ppb
  • SO2: 1.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.21 µg/m³
  • PM10: 3.78 µg/m³
  • O3: 0.035 ppm
  • NO2: 3.5 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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