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

Areas of Severe Thunderstorms and Heavy Rain Possible through the Weekend

There will be daily chances for scattered thunderstorms across portions of the Central and Eastern U.S. through the weekend, with severe thunderstorms possible in the northern Plains and Upper Midwest. Potential severe storm hazards may include large hail, damaging winds, and a few tornadoes. Storms could also produce heavy rain that may lead to isolated instances of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Mostly Cloudy

88°F

31°C

Humidity 62%
Wind Speed Vrbl 5 mph
Barometer 29.99 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 29 Jun 11:50 am CDT
Extended Forecast for

Romeoville IL

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 93 °F

    Isolated
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South wind around 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 85. South southwest wind 5 to 10 mph becoming west northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. Northwest wind 5 to 10 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South wind around 5 mph.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 85. South southwest wind 5 to 10 mph becoming west northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Partly cloudy, with a low around 65. Northwest wind 5 to 10 mph.
Tuesday
Sunny, with a high near 85. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Mostly sunny, with a high near 89.
Thursday Night
Partly cloudy, with a low around 68.
Independence Day
Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 73.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Romeoville IL
 41.63°N 88.07°W
Last Update:
10:57 am CDT Jun 29, 2025
Forecast Valid:
12pm CDT Jun 29, 2025-6pm CDT Jul 5, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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