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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Light Rain Fog/Mist

66°F

19°C

Humidity 100%
Wind Speed NE 9 mph
Barometer 29.97 in
Dewpoint 66°F (19°C)
Visibility 2.00 mi
Last update 20 Sep 11:50 am CDT
Extended Forecast for

Lockport IL

Flood Watch September 20, 12:25pm until September 20, 01:00pm
Click here for hazard details and duration
...
  •  
    Flood Watch September 20, 12:25pm until September 20, 01:00pm

    NOW until 1:00pm Sun

    Flood Watch

  • This Afternoon

    High: 66 °F

    Showers

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 4am. Cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 58 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly between 7am and 9am. Cloudy, with a high near 65. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 63. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 63 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Showers. Steady temperature around 66. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
A 40 percent chance of showers, mainly before 4am. Cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday
A 30 percent chance of showers, mainly between 7am and 9am. Cloudy, with a high near 65. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 63. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 52.
Friday
Mostly sunny, with a high near 69.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lockport IL
 41.59°N 88.05°W
Last Update:
11:41 am CDT Sep 20, 2026
Forecast Valid:
12pm CDT Sep 20, 2026-6pm CDT Sep 26, 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