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

Lansing Municipal Airport (KIGQ)

Lat: 41.54°NLon: 87.53°WElev: 607ft.

Overcast

67°F

19°C

Humidity 80%
Wind Speed N 6 mph
Barometer 30.28 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 18 Sep 11:55 am CDT
Extended Forecast for

Olympia Fields IL

  • This Afternoon

    This Afternoon: Isolated showers after 2pm. Mostly cloudy, with a high near 74. East northeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.

    High: 74 °F

    Isolated
    Showers

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 60. East southeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 60 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 76. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 76 °F

    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 63. East wind around 5 mph becoming north northeast after midnight. Chance of precipitation is 90%.

    Low: 63 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 70. Northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    High: 70 °F

    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    T-storms

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers. Cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63.

    High: 63 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Isolated showers after 2pm. Mostly cloudy, with a high near 74. East northeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 60. East southeast wind around 10 mph, with gusts as high as 15 mph.
Saturday
Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 76. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 63. East wind around 5 mph becoming north northeast after midnight. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm. High near 70. Northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
Monday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
Monday Night
A chance of showers. Cloudy, with a low around 52.
Tuesday
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 52.
Thursday
Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olympia Fields IL
 41.51°N 87.7°W
Last Update:
11:36 am CDT Sep 18, 2026
Forecast Valid:
12pm CDT Sep 18, 2026-6pm CDT Sep 24, 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