Today | Weather | Friday, April 3, 2026

Active Weather Warnings

Flood Watch

Weather in Chicago, Illinois

05:58 PM

Now

43° F

Feels Like 34°

Precipitation 39 %

Wind 15 mph

UV Index (0 - 11+) 0

Humidity 76 %

Today

Day 54°

Night 43°

Precipitation 49 %

Wind 10 mph

UV Index (0 - 11+) 6

Chicago Weather Forecast Updated

32 minutes ago

Last updated on April 03, 2026 at 5:26 PM

Weather Forecast History

Last Year's Weather on This Day (April 3, 2025)

Day

52°

Night

41°

Wind

15 mph

UV Index

Precipitation

1 %

Air Quality in Chicago

NOW

28 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 2.12 µg/m³

PM₁₀ 2.31 µg/m³

O₃ 0.030 ppm

NO₂ 2.4 ppb

SO₂ 0.3 ppb

CO 0.13 ppm

NH₃ 2.45 µg/m³

NO 0.01 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 – 2.12 µg/m³

PM₁₀ – 2.31 µg/m³

O₃ – 58.86 µg/m³

NO₂ – 4.47 µg/m³

SO₂ – 0.7 µg/m³

CO – 154.32 µg/m³

NH₃ – 2.45 µg/m³

NO – 0.01 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Chicago

Severe Future Possible

Flood Watch

Flood Watch issued April 3 at 3:56PM CDT until April 4 at 10:00AM CDT by NWS Chicago IL

Apr 3, 7:00 PM → Apr 4, 10:00 AM

WHAT: Flash flooding caused by excessive rainfall is possible.

WHERE: Portions of northern and central Illinois and northwest
Indiana.

WHEN: From 7 PM CDT /8 PM EDT/ this evening through Saturday
morning.

IMPACTS: Roads and streets may be flooded. Area creeks and
streams are already elevated, increasing the risk of flooding due
to additional rainfall.

ADDITIONAL DETAILS:
- Recent rounds of heavy rainfall have left soils saturated and
stream and creek levels elevated across the area. Additional
rounds of heavy rainfall this evening and overnight may lead
to rapid run-off and an increased threat of flash flooding.
- http://www.weather.gov/safety/flood

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A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.

Updated: Apr 3, 5:26 PM Source: NWS Alert