Cook County Weather Forecast
Cook County weather: 57°F, clear sky. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Weekend outlook
🌤️ 62° / 53°
Mainly clear · 3% rain · wind 11 mph
🌤️ 72° / 49°
Mainly clear · 4% rain · wind 11 mph
Best time to go outside today
3 PM - 6 PM · comfort score 8.2/10
The best window to be outside is roughly 3 PM to 6 PM, when temperature, rain chance and wind line up best.
Is today a good day to visit?
Activity scores from 0 to 10 based on temperature, rain, wind, sun and visibility.
Active alerts for Cook County
Flood Advisory issued October 1 at 8:44PM CDT until October 1 at 10:15PM CDT by NWS Chicago IL
Issued by NWS Chicago IL
Flood Watch issued October 1 at 2:44PM CDT until October 1 at 10:00PM CDT by NWS Chicago IL
Issued by NWS Chicago IL
What to pack, what to skip
- Sunglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 63°F, so mornings feel nothing like afternoons
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
See the Cook County forecast by time range
Cook County weather - more answers
Explore Cook County
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Cook County?
Cook County is a county in Illinois. Its coordinates are 41.8781, -87.6298. It lies in North America.
What is the weather like in Cook County right now?
It is currently 57°F (14°C) with clear sky. Humidity is 70% and wind is 6 mph.
When is the best time to visit Cook County?
May, June, August, September and October offer the most comfortable conditions in Cook County, which has a continental climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Cook County in?
Cook County observes America/Chicago (UTC-05:00). The local time is 6:10 PM.
How many people live in Cook County?
Cook County has a population of approximately 5.1 million.
What is the nearest airport to Cook County?
The closest airports are O'Hare International Airport (ORD), 16 mi away.
What are the top things to do in Cook County?
Popular options include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated October 2, 2026 at 6:10 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
