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 >

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Fog/Mist

66°F

19°C

Humidity 100%
Wind Speed S 10 mph
Barometer 29.96 in
Dewpoint 66°F (19°C)
Visibility 3.00 mi
Last update 19 Sep 11:45 am CDT
Extended Forecast for

4 Miles WNW Plainfield IL

Flood Watch September 19, 12:43pm until September 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 12:43pm until September 20, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • This Afternoon

    High: 77 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 9pm.  Low around 65. East southeast wind around 5 mph becoming northwest after midnight. Winds could gust as high as 10 mph.  Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 65 °F

    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm.  Cloudy, with a steady temperature around 67. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 67 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of showers.  Mostly cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers.  Mostly cloudy, with a high near 64. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Chance
    Showers

  • Monday Night

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

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm.  Mostly cloudy, with a high near 63.

    High: 63 °F

    Slight Chance
    Showers

  • Tuesday Night

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

    Low: 52 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 3pm, then a chance of showers and thunderstorms after 3pm. Cloudy, with a high near 77. South wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 9pm. Low around 65. East southeast wind around 5 mph becoming northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Sunday
Showers likely and possibly a thunderstorm. Cloudy, with a steady temperature around 67. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday
A 40 percent chance of showers. Mostly cloudy, with a high near 64. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 52.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 63.
Tuesday Night
Mostly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 68.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 71.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Plainfield IL
 41.64°N 88.28°W
12:11 pm CDT Sep 19, 2026
12pm CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database