National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Chicago / West Chicago, Dupage Airport (KDPA)

Lat: 41.9°NLon: 88.25°WElev: 758ft.

Partly Cloudy

68°F

20°C

Humidity 83%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 11:52 pm CDT
Extended Forecast for

Naperville IL

  • Overnight

    Overnight: Patchy fog after 2am. Otherwise, mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the morning.

    High: 83 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. South wind around 5 mph.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 82. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 87.

    High: 87 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 73.

    Low: 73 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 63. Calm wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the morning.
Friday Night
Partly cloudy, with a low around 62. South wind around 5 mph.
Saturday
Increasing clouds, with a high near 82. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 86.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Partly sunny, with a high near 87.
Monday Night
Mostly cloudy, with a low around 73.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 72.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 71.
Thursday
A chance of showers. Mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Naperville IL
 41.77°N 88.15°W
Last Update:
9:56 pm CDT Aug 27, 2026
Forecast Valid:
12am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation