Today | Weather | Thursday, October 30, 2025

Weather in Chicago, Illinois

01:30 PM

Now

54° F

Feels Like 50°

Precipitation 0 %

Wind 15 mph

UV Index (0 - 11+) 3

Humidity 58 %

Today

Day 55°

Night 43°

Precipitation 0 %

Wind 15 mph

UV Index (0 - 11+) 3

Chicago Weather Forecast Updated

2 minutes ago

Last updated on October 30, 2025 1:27 PM

Weather Forecast History

Last Year's Weather on This Day (October 30, 2024)

Day

81°

Night

64°

Wind

19 mph

Precipitation

Air Quality in Chicago

NOW

33 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 3.23 µg/m³

PM₁₀ 4.03 µg/m³

O₃ 0.035 ppm

NO₂ 2.4 ppb

SO₂ 1.1 ppb

CO 0.12 ppm

NH₃ 1.05 µg/m³

NO 1.65 µg/m³

PM_2.5 – 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)

PM_2.5 – 3.23 µg/m³

PM₁₀ – 4.03 µg/m³

O₃ – 69.4 µg/m³

NO₂ – 4.59 µg/m³

SO₂ – 2.77 µg/m³

CO – 137.66 µg/m³

NH₃ – 1.05 µg/m³

NO – 1.65 µg/m³

View Hourly Air Quality Forecast