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

Heavy to Excessive Rainfall This Week from the Southwest into Central U.S.

Pacific tropical moisture wrapping into a storm over the southwest U.S. will continue a multi-day heavy rainfall event this week that will extend into the Midwest and southern Plains. Considerable flash flooding is possible across portions of New Mexico and west Texas today through Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Fair

79°F

26°C

Humidity 39%
Wind Speed S 6 G 13 mph
Barometer 29.97 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 29 Sep 2:45 pm CDT
Extended Forecast for

Lemont IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 77. South southwest wind around 5 mph, with gusts as high as 10 mph.

    High: 77 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 63 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Showers. Steady temperature around 65. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 65 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms after 7pm. Cloudy, with a low around 65. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then showers between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 72. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers
    Likely then
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 59. Chance of precipitation is 90%.

    Low: 59 °F

    Showers

  • Friday

    Friday: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 66.

    High: 66 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 77. South southwest wind around 5 mph, with gusts as high as 10 mph.
Tonight
Mostly cloudy, with a low around 63. South wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday
Showers. Steady temperature around 65. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms after 7pm. Cloudy, with a low around 65. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then showers between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 72. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm. Low around 59. Chance of precipitation is 90%.
Friday
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 66.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 65.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 46.
Monday
Sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lemont IL
 41.67°N 87.98°W
Last Update:
3:01 pm CDT Sep 29, 2026
Forecast Valid:
3pm CDT Sep 29, 2026-6pm CDT Oct 5, 2026
 
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