Cook County, IL Weather Forecast
County weather hub
Chance Showers And Thunderstorms
Compare major city weather across Cook County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
County Weather Overview
This county weather page brings together forecast coverage for Cook County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 27 of 27 mapped cities in Cook County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 10 to Jul 14, 2026
- Latest sync
- Jul 7, 2026 8:54 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Cook County
Tuesday looks like the warmest upcoming period in Cook County at 92 degrees F.
Friday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Friday at about 5 to 10 mph NNE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 7, 2026 8:54 PM CDT
- Coverage
- 5 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 between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 82.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70.
Mostly sunny, with a high near 86.
Mostly clear, with a low around 71.
Sunny, with a high near 89.
Mostly clear, with a low around 73.
Sunny, with a high near 92.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 10
|
Chance Showers And Thunderstorms
|
78°F |
5 to 10 mph
NNE
|
|
Friday Night
Jul 10
|
Chance Showers And Thunderstorms
|
68°F |
5 to 10 mph
NNE
|
|
Saturday
Jul 11
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
82°F |
5 to 10 mph
NNE
|
|
Saturday Night
Jul 11
|
Slight Chance Showers And Thunderstorms
|
70°F |
0 to 10 mph
NE
|
|
Sunday
Jul 12
|
Mostly Sunny
|
86°F |
0 to 10 mph
ENE
|
|
Sunday Night
Jul 12
|
Mostly Clear
|
71°F |
0 to 5 mph
S
|
|
Monday
Jul 13
|
Sunny
|
89°F |
0 to 5 mph
WSW
|
|
Monday Night
Jul 13
|
Mostly Clear
|
73°F |
5 mph
SW
|
|
Tuesday
Jul 14
|
Sunny
|
92°F |
5 to 10 mph
WSW
|
Major City Forecasts
Live forecast snapshots for major cities across Cook County.
Coverage
Forecast coverage currently spans 27 of 27 mapped cities in Cook County.
Largest mapped city population in this region: 72,683.
