Cook County, IL Weather Forecast
County weather hub
Chance Rain Showers
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. Mostly cloudy, with a high near 68.
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 20, 2026
- Latest sync
- May 14, 2026 3:40 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Cook County
Wednesday looks like the warmest upcoming period in Cook County at 68 degrees F.
Wednesday is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Wednesday at about 10 mph N.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- May 14, 2026 3:40 AM CDT
- Coverage
- 1 day
- 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
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
May 20
|
Chance Rain Showers
|
68°F |
10 mph
N
|
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.