Today | Weather | Tuesday, June 30, 2026
Active Weather Warnings

Weather in Joliet, Illinois

03:25 PM
Now
Cloudy Weather
93° F
Feels Like 106°
Precipitation 0 %
Wind 13 mph
UV Index (0 - 11+) 7
Humidity 57 %
Today
Cloudy Weather
Day 93°
Night 73°
Precipitation 0 %
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.

Joliet Weather Forecast Updated

24 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (June 30, 2025)
Sunny with a Chance of Thunderstorms

Day

91°

Night

66°

Wind

8 mph

UV Index

11

Precipitation

55 %

Air Quality in Joliet

NOW
38 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.09 µg/m³
PM10 14.63 µg/m³
O3 0.038 ppm
NO2 0.4 ppb
SO2 0.6 ppb
CO 0.09 ppm
NH3 0.78 µg/m³
NO 0.15 µg/m³
PM2.5 – 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)
PM2.59.09 µg/m³
PM1014.63 µg/m³
O375.1 µg/m³
NO20.68 µg/m³
SO21.61 µg/m³
CO103.66 µg/m³
NH30.78 µg/m³
NO0.15 µg/m³

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, 3:01 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
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, 1:26 AM Source: NWS Alert