Today | Weather | Saturday, April 4, 2026

Weather in Chicago, Illinois

08:06 PM
Now
Rainy Weather
45° F
Feels Like 34°
Precipitation 40 %
Wind 17 mph
Humidity 66 %
Today
Cloudy Night
Day 57°
Night 37°
Precipitation 40 %
Wind 16 mph

Chicago Weather Forecast Updated

13 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 4, 2025)
Partly Sunny with Showers

Day

48°

Night

41°

Wind

11 mph

UV Index

3

Precipitation

77 %

Air Quality in Chicago

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.83 µg/m³
PM10 0.98 µg/m³
O3 0.048 ppm
NO2 0.8 ppb
SO2 0.3 ppb
CO 0.13 ppm
NH3 3.8 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)
PM2.50.83 µg/m³
PM100.98 µg/m³
O394.63 µg/m³
NO21.46 µg/m³
SO20.88 µg/m³
CO151.34 µg/m³
NH33.8 µg/m³
NO0 µg/m³