Cook County, IL Weather Forecast
County weather hub
Partly Sunny
Compare major city weather across Cook County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Partly sunny, with a high near 72.
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
- May 25 to May 28, 2026
- Latest sync
- May 21, 2026 10:11 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 74 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 10 mph SE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- May 21, 2026 10:11 PM CDT
- Coverage
- 4 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
Partly cloudy, with a low around 60.
Mostly sunny, with a high near 74.
A chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 61.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 72.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 73.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Partly Sunny
|
72°F |
0 to 5 mph
ESE
|
|
Monday Night
May 25
|
Partly Cloudy
|
60°F |
5 mph
SE
|
|
Tuesday
May 26
|
Mostly Sunny
|
74°F |
5 to 10 mph
SE
|
|
Tuesday Night
May 26
|
Chance Showers And Thunderstorms
|
61°F |
5 to 10 mph
ESE
|
|
Wednesday
May 27
|
Chance Rain Showers
|
72°F |
5 to 10 mph
ENE
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms
|
61°F |
5 to 10 mph
NE
|
|
Thursday
May 28
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
73°F |
5 to 10 mph
ENE
|
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.
