Today | Weather | Monday, September 21, 2026

Weather in Champaign, Illinois

01:56 PM
Now
Cloudy Weather
66° F
Feels Like 64°
Precipitation 34 %
Wind 10 mph
UV Index (0 - 11+) 1
Humidity 83 %
Today
Rainy Weather
Day 66°
Night 57°
Precipitation 87 %
Wind 10 mph
UV Index (0 - 11+) 1

Champaign Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Stormy Weather

Day

84°

Night

64°

Wind

6 mph

Precipitation

92 %

Air Quality in Champaign

NOW
29 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.19 µg/m³
PM10 3.27 µg/m³
O3 0.031 ppm
NO2 1.3 ppb
SO2 0.3 ppb
CO 0.16 ppm
NH3 0.34 µg/m³
NO 0.33 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)
PM2.53.19 µg/m³
PM103.27 µg/m³
O361.51 µg/m³
NO22.49 µg/m³
SO20.74 µg/m³
CO188.24 µg/m³
NH30.34 µg/m³
NO0.33 µg/m³