Today | Weather | Wednesday, October 15, 2025

Weather in Chicago, Illinois

02:32 AM

Now

61° F

Feels Like 55°

Precipitation 23 %

Wind 15 mph

Humidity 76 %

Today

Day 63°

Night 55°

Precipitation 55 %

Wind 12 mph

UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Chicago Weather Forecast Updated

Weather Forecast History

Last Year's Weather on This Day (October 15, 2024)

Day

48°

Night

43°

Wind

16 mph

Precipitation

Air Quality in Chicago

NOW

38 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 9.15 µg/m³

PM₁₀ 10.43 µg/m³

O₃ 0.024 ppm

NO₂ 6 ppb

SO₂ 0.9 ppb

CO 0.16 ppm

NH₃ 0.97 µg/m³

NO 0 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 – 9.15 µg/m³

PM₁₀ – 10.43 µg/m³

O₃ – 46.66 µg/m³

NO₂ – 11.24 µg/m³

SO₂ – 2.45 µg/m³

CO – 179.1 µg/m³

NH₃ – 0.97 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast