Hourly Weather | Today Thursday, February 26, 2026
Active Weather Warnings
Decatur, Illinois
1 AM
Cloudy Night
39°
Feels Like 34°
0
Humidity: 78%
UV Index: 0
Wind: 7 mph
2 AM
Cloudy Night
37°
Feels Like 34°
0
Humidity: 79%
UV Index: 0
Wind: 7 mph
3 AM
Cloudy Night
37°
Feels Like 32°
0
Humidity: 80%
UV Index: 0
Wind: 7 mph
4 AM
Cloudy Night
36°
Feels Like 30°
0
Humidity: 81%
UV Index: 0
Wind: 7 mph
5 AM
Cloudy Night
36°
Feels Like 30°
0
Humidity: 83%
UV Index: 0
Wind: 8 mph
6 AM
Cloudy Night
36°
Feels Like 30°
0
Humidity: 80%
UV Index: 0
Wind: 8 mph
7 AM
Sunny Weather
37°
Feels Like 30°
0
Humidity: 81%
UV Index: 1
Wind: 9 mph
8 AM
Sunny Weather
41°
Feels Like 36°
0
Humidity: 78%
UV Index: 1
Wind: 10 mph
9 AM
Sunny Weather
46°
Feels Like 43°
0
Humidity: 66%
UV Index: 2
Wind: 12 mph
10 AM
Sunny Weather
54°
Feels Like 52°
0
Humidity: 55%
UV Index: 3
Wind: 13 mph
11 AM
Sunny Weather
57°
Feels Like 57°
0
Humidity: 46%
UV Index: 4
Wind: 14 mph
12 PM
Sunny Weather
63°
Feels Like 61°
0
Humidity: 41%
UV Index: 4
Wind: 15 mph
1 PM
Sunny Weather
64°
Feels Like 64°
0
Humidity: 37%
UV Index: 4
Wind: 15 mph
2 PM
Sunny Weather
68°
Feels Like 66°
0
Humidity: 32%
UV Index: 3
Wind: 16 mph
3 PM
Sunny Weather
66°
Feels Like 64°
0
Humidity: 33%
UV Index: 2
Wind: 16 mph
4 PM
Sunny Weather
66°
Feels Like 64°
0
Humidity: 34%
UV Index: 1
Wind: 15 mph
5 PM
Sunny Weather
63°
Feels Like 59°
0
Humidity: 38%
UV Index: 1
Wind: 13 mph
6 PM
Night
61°
Feels Like 55°
0
Humidity: 44%
UV Index: 0
Wind: 10 mph
7 PM
Night
57°
Feels Like 52°
0
Humidity: 49%
UV Index: 0
Wind: 10 mph
8 PM
Night
54°
Feels Like 48°
0
Humidity: 54%
UV Index: 0
Wind: 12 mph
9 PM
Night
52°
Feels Like 46°
0
Humidity: 58%
UV Index: 0
Wind: 12 mph
10 PM
Cloudy Night
48°
Feels Like 43°
0
Humidity: 64%
UV Index: 0
Wind: 10 mph
11 PM
Cloudy Night
46°
Feels Like 43°
0
Humidity: 68%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
28 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.84 µg/m³
  • PM10: 7.25 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.89 µg/m³
  • PM10: 6.2 µg/m³
  • O3: 0.029 ppm
  • NO2: 4.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.32 µg/m³
  • PM10: 5.59 µg/m³
  • O3: 0.028 ppm
  • NO2: 4.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.92 µg/m³
  • PM10: 5.16 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.97 µg/m³
  • PM10: 5.23 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.38 µg/m³
  • PM10: 5.65 µg/m³
  • O3: 0.029 ppm
  • NO2: 3.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.68 µg/m³
  • PM10: 6.03 µg/m³
  • O3: 0.027 ppm
  • NO2: 3.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.63 µg/m³
  • PM10: 6.09 µg/m³
  • O3: 0.027 ppm
  • NO2: 4.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.42 µg/m³
  • PM10: 5.96 µg/m³
  • O3: 0.028 ppm
  • NO2: 3.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.56 µg/m³
  • PM10: 5.06 µg/m³
  • O3: 0.034 ppm
  • NO2: 2.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.18 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: 4.13 µg/m³
  • PM10: 4.65 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.16 µg/m³
  • PM10: 4.72 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.4 µg/m³
  • PM10: 3.91 µg/m³
  • O3: 0.046 ppm
  • NO2: 2 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.23 µg/m³
  • PM10: 3.72 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.32 µg/m³
  • PM10: 3.86 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.7 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.8 µg/m³
  • PM10: 4.53 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.48 µg/m³
  • PM10: 5.52 µg/m³
  • O3: 0.040 ppm
  • NO2: 5.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.12 µg/m³
  • PM10: 6.46 µg/m³
  • O3: 0.034 ppm
  • NO2: 8.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.20 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: 5.78 µg/m³
  • PM10: 7.4 µg/m³
  • O3: 0.030 ppm
  • NO2: 10.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

8 PM
27 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.53 µg/m³
  • PM10: 8.37 µg/m³
  • O3: 0.027 ppm
  • NO2: 10.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.19 µg/m³
  • PM10: 9.17 µg/m³
  • O3: 0.026 ppm
  • NO2: 10.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.24 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.56 µg/m³
  • PM10: 9.56 µg/m³
  • O3: 0.024 ppm
  • NO2: 10.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.24 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.94 µg/m³
  • PM10: 9.91 µg/m³
  • O3: 0.023 ppm
  • NO2: 10.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Decatur

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued February 25 at 8:11PM CST by NWS Lincoln IL
Feb 25, 8:11 PM Feb 26, 3:00 AM
Light snow will spread southeast across central IL tonight. The snow
will initially melt on roadways. However, with temperatures falling
below freezing, this moisture will likely freeze and cause slick
spots. Snow accumulations will be light, generally an inch or less
for most areas, ending prior to sunrise.
Updated: Feb 25, 11:55 PM Source: NWS Alert