Hourly Weather Forecast for Joliet, Illinois

Hourly Weather | Today › Tuesday, June 30, 2026

Active Weather Warnings

Extreme Heat Warning
Heat Advisory

Joliet, Illinois

6 PM

91°

Feels Like 102°

Humidity: 63%

UV Index: 2

Wind: 13 mph

7 PM

90°

Feels Like 99°

Humidity: 68%

UV Index: 1

Wind: 12 mph

8 PM

88°

Feels Like 97°

Humidity: 71%

UV Index: 0

Wind: 10 mph

9 PM

84°

Feels Like 93°

Humidity: 78%

UV Index: 0

Wind: 8 mph

10 PM

82°

Feels Like 91°

Humidity: 83%

UV Index: 0

Wind: 7 mph

11 PM

81°

Feels Like 90°

Humidity: 86%

UV Index: 0

Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

6 PM

50 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.21 µg/m³
PM₁₀: 18.02 µg/m³
O₃: 0.043 ppm
NO₂: 0.7 ppb
SO₂: 0.8 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM

52 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 13.03 µg/m³
PM₁₀: 18.76 µg/m³
O₃: 0.044 ppm
NO₂: 0.9 ppb
SO₂: 0.9 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM

53 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 13.2 µg/m³
PM₁₀: 18.84 µg/m³
O₃: 0.043 ppm
NO₂: 1.1 ppb
SO₂: 1 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM

52 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.78 µg/m³
PM₁₀: 18.18 µg/m³
O₃: 0.041 ppm
NO₂: 1.4 ppb
SO₂: 1 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM

49 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 11.85 µg/m³
PM₁₀: 16.87 µg/m³
O₃: 0.038 ppm
NO₂: 1.5 ppb
SO₂: 1 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM

44 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.67 µg/m³
PM₁₀: 15.17 µg/m³
O₃: 0.034 ppm
NO₂: 1.6 ppb
SO₂: 0.9 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Joliet

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued June 30 at 2:24PM CDT until July 3 at 12:00AM CDT by NWS Chicago IL

Jun 30, 2:24 PM → Jul 3, 12:00 AM

WHAT: Dangerously hot conditions with heat index values around
105 expected each afternoon.

WHERE: Portions of central, east central, north central, and
northeast Illinois and northwest Indiana.

WHEN: Until midnight CDT /1 AM EDT/ Thursday Night.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

ADDITIONAL DETAILS: Dangerous heat expected to persist through
Thursday. Thunderstorms may begin to bring some relief from the
heat for portions of northern Illinois by Thursday afternoon or
evening.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Jun 30, 4:32 PM Source: NWS Alert

Moderate Expected Likely

Heat Advisory

Heat Advisory issued June 29 at 8:53PM CDT until July 1 at 10:00PM CDT by NWS Chicago IL

Jun 29, 8:53 PM → Jul 1, 10:00 PM

WHAT: Heat index values around 105 expected each afternoon

WHERE: Portions of central, east central, north central, and
northeast Illinois and northwest Indiana.

WHEN: Until 10 PM CDT /11 PM EDT/ Wednesday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

+ Read More

Updated: Jun 30, 1:26 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

Pollutant Concentrations:

Health Recommendations:

Pollutant Concentrations:

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Pollutant Concentrations:

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Weather Alerts and Warnings for Joliet

Extreme Heat Warning

Heat Advisory

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