Next 24 hours

US AQI

35Now
45
44
4410 PM
43
43
421 AM
41
40
394 AM
37
39
407 AM
41
41
4010 AM
39
42
441 PM
47
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474 PM
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45

Air quality outlook

Worst hour each day

Today49Good
Thu 847Good
Fri 980Moderate
Sat 10122Unhealthy for sensitive groups
Sun 1178Moderate

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

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About Joliet weather

Joliet is in Will County, Illinois, United States at 41.53°, -88.08°. Right now it’s 70° and clear; today’s high is 80° with a 0% chance of rain.

Illinois has a humid continental climate with distinct seasons marked by cold, snowy winters and hot, humid summers. The state's flat terrain allows weather systems to move across without obstruction, leading to rapid temperature changes. Chicago's position on Lake Michigan creates a unique lake-effect weather pattern that can moderate summer heat and intensify winter snowfall.