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Today | Weather | Wednesday, February 25, 2026
Active Weather Warnings

Weather in Decatur, Illinois

10:21 PM
Now
Snowy Weather
39° F
Feels Like 34°
Precipitation 63 %
Wind 7 mph
Humidity 60 %
Today
Snowy Weather
Day 50°
Night 32°
Precipitation 100 %
Wind 8 mph

Decatur Weather Forecast Updated

Last updated on

Air Quality in Decatur

NOW
45 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.74 µg/m³
PM10 11.81 µg/m³
O3 0.026 ppm
NO2 7.9 ppb
SO2 0.7 ppb
CO 0.23 ppm
NH3 0.4 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

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

Show raw pollutant concentrations (µg/m³)
PM2.5 – 10.74 µg/m³
PM10 – 11.81 µg/m³
O3 – 51.06 µg/m³
NO2 – 14.79 µg/m³
SO2 – 1.92 µg/m³
CO – 261.17 µg/m³
NH3 – 0.4 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

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, 8:51 PM Source: NWS Alert