Today | Weather | Thursday, September 4, 2025

Weather in Naperville, Illinois

02:43 PM
Now
Cloudy WeatherCloudy weather, overcast skies with clouds.
64° F
Feels Like 64°
Precipitation 0 %
Wind 16 mph
UV Index (0 - 11+) 11
Humidity 47 %
Today
Cloudy WeatherCloudy weather, overcast skies with clouds.
Day 66°
Night 55°
Precipitation 1 %
Wind 10 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Naperville Weather Forecast Updated

10 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 4, 2024)

Sunny WeatherSunny weather, clear skies and sunny weather.

Day

82°

Night

61°

Wind

6 mph

UV Index

6

Precipitation

1

Air quality in Naperville

NOW
59 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.46 µg/m³
PM10 15.30 µg/m³
O₃ 30.34 ppb
NO₂ 5.05 ppb
SO₂ 0.52 ppb
CO 186.32 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.