Today | Weather | Monday, June 29, 2026
Active Weather Warnings

Weather in Naperville, Illinois

06:58 PM
Now
Cloudy Weather
90° F
Feels Like 99°
Precipitation 4 %
Wind 13 mph
UV Index (0 - 11+) 1
Humidity 63 %
Today
Cloudy Weather
Day 91°
Night 75°
Precipitation 25 %
Wind 14 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.

Naperville Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (June 29, 2025)
Cloudy Weather

Day

93°

Night

70°

Wind

7 mph

UV Index

10

Precipitation

25 %

Air Quality in Naperville

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

Pollutant Concentrations:

PM2.5 6.98 µg/m³
PM10 9.18 µg/m³
O3 0.031 ppm
NO2 1.2 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 0.99 µg/m³
NO 0.11 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)
PM2.56.98 µg/m³
PM109.18 µg/m³
O361.58 µg/m³
NO22.17 µg/m³
SO21.64 µg/m³
CO121.21 µg/m³
NH30.99 µg/m³
NO0.11 µg/m³

Weather Alerts and Warnings for Naperville

Moderate Expected Likely

Heat Advisory

Heat Advisory issued June 29 at 3:13PM CDT until July 1 at 10:00PM CDT by NWS Chicago IL
Jun 29, 3:13 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.
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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 29, 5:52 PM Source: NWS Alert