South Chicago Heights, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for South Chicago Heights, IL in one place.
A chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 89. Heat index values as high as 100. West northwest wind 10 to 15 mph. Chance of precipitation is 50%.
Local Weather Overview
This forecast page for South Chicago Heights, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 17, 2026 6:55 AM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for South Chicago Heights, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 6:55 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in South Chicago Heights
Saturday looks like the warmest upcoming period in South Chicago Heights at 89 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Saturday at about 10 to 15 mph WNW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 6:55 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 66. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunny, with a high near 83.
Mostly clear, with a low around 64.
Mostly sunny, with a high near 86.
A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 70.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 86.
Partly cloudy, with a low around 63.
Sunny, with a high near 78.
Mostly clear, with a low around 59.
Sunny, with a high near 79.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Chance Showers And Thunderstorms
|
89°F |
10 to 15 mph
WNW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Mostly Clear
|
66°F |
5 to 10 mph
NNE
|
|
Sunday
Jul 19
|
Sunny
|
83°F |
5 mph
NE
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
64°F |
0 to 5 mph
ESE
|
|
Monday
Jul 20
|
Mostly Sunny
|
86°F |
5 to 15 mph
SSW
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms
|
70°F |
10 to 15 mph
SW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Mostly Sunny
|
86°F |
10 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Partly Cloudy
|
63°F |
10 to 15 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
78°F |
10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
59°F |
0 to 10 mph
NNW
|
|
Thursday
Jul 23
|
Sunny
|
79°F |
0 to 5 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around South Chicago Heights.