Cook County (Chicago)
Tomorrow
Tomorrow weather in Cook County
Monday, September 21st, 2026
17°
Overcast
Feels like 14° · Low 15°
The weather tomorrow in Cook County will be colder than today, with max temperatures of 16°.
The rain will stop, and no rain is expected in Cook County tomorrow.
17° / 15°
Temp
18%
Rain
19 km/h
Wind
69%
Humidity
Cook County Weather Pages
Cook County hourly forecast for tomorrow
Scroll right to see more weather forecasts for Cook County tomorrow
| 12:00 AM | 01:00 AM | 02:00 AM | 03:00 AM | 04:00 AM | 05:00 AM | 06:00 AM | 06:37 AM | 07:00 AM | 08:00 AM | 09:00 AM | 10:00 AM | 11:00 AM | 12:00 PM | 01:00 PM | 02:00 PM | 03:00 PM | 04:00 PM | 05:00 PM | 06:00 PM | 06:50 PM | 07:00 PM | 08:00 PM | 09:00 PM | 10:00 PM | 11:00 PM | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| weather |  | | | | | | |  | | | | | | | | | | | | |  | | | | |  | Next |
| temperatures | 15.9° | 15.6° | 15.2° | 14.8° | 14.7° | 14.6° | 14.5° | Sunrise | 14.6° | 14.8° | 15.2° | 15.3° | 15.1° | 14.9° | 15.2° | 15.4° | 15.9° | 16.5° | 16.8° | 16.6° | Sunset | 16.6° | 16.7° | 16.6° | 16.4° | 15.9° | |
| Feels like | 13.4° | 12.7° | 11.8° | 11.2° | 11.6° | 11.5° | 11.6° | 11.4° | 11.4° | 11.9° | 11.5° | 11.5° | 11.6° | 12.2° | 12.4° | 12.9° | 13.6° | 13.9° | 13.9° | 13.6° | 13.4° | 13° | 12.5° | 11.5° | |||
| wind speed | 18 km/h | 18 km/h | 18 km/h | 19 km/h | 17 km/h | 17 km/h | 16 km/h | 17 km/h | 18 km/h | 17 km/h | 19 km/h | 18 km/h | 16 km/h | 15 km/h | 15 km/h | 15 km/h | 14 km/h | 14 km/h | 13 km/h | 14 km/h | 17 km/h | 18 km/h | 18 km/h | 19 km/h | |||
| wind degree | 70° | 69° | 67° | 71° | 73° | 70° | 67° | 65° | 65° | 67° | 69° | 74° | 70° | 65° | 62° | 59° | 58° | 59° | 57° | 54° | 56° | 57° | 63° | 62° | |||
| wind direction | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | NE | ENE | ENE | ENE | ENE | |||
| Precipitation | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm | |||
| chance for rain | 25% | 23% | 19% | 19% | 21% | 21% | 22% | 22% | 21% | 19% | 18% | 18% | 18% | 18% | 17% | 16% | 15% | 15% | 15% | 15% | 15% | 15% | 14% | 6% | |||
| chance for snow | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | |||
| humidity | 82% | 78% | 72% | 72% | 74% | 76% | 76% | 76% | 75% | 72% | 69% | 68% | 69% | 68% | 67% | 65% | 62% | 61% | 61% | 61% | 62% | 62% | 59% | 56% | |||
| dew point | 12.8° | 11.9° | 10.1° | 9.8° | 10.2° | 10.4° | 10.4° | 10.5° | 10.4° | 10.2° | 9.6° | 9.3° | 9.3° | 9.4° | 9.3° | 9.4° | 9.3° | 9.3° | 9.1° | 9.1° | 9.5° | 9.3° | 8.5° | 7.2° | |||
| visibility | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | 10 km | |||
| cloud cover | 100% | 100% | 98% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 49% | |||
| UV | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.2 | 0.6 | 1.3 | 1.7 | 2.2 | 1.5 | 1.2 | 1 | 0.6 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 |
Weather in Cook County tomorrow
The weather in Cook County tomorrow is expected to be much cooler than usual, with a forecast temperature of 17 °F, compared to an average of 24 °F for September 21st in recent years.
temperatures
17 °F
rain
0 mm
wind
19 km/h
UV
Low
🌫️ Air quality, UV & pollen - Cook County Live AQI, UV index and pollen levels. Air Quality →
Cook County Tomorrow Weather Indexes for Outdoor Activities & Health
Weather indexes for tomorrow: outdoor activities, pollen allergies, air quality (AQI), UV index and health in Cook County - Monday, September 21st, 2026
UV Sun Exposure Risk
Low
2 / 11+
Air Quality Index (AQI)
Excellent
10 / 10
Pollen Allergy Risk
Very High
10 / 10
Asthma Risk Index
Low
3 / 10
Arthritis Pain Index
Low
3 / 10
Outdoor Activity Index
Excellent
10 / 10
Running & Jogging Index
Excellent
8 / 10
Cycling Weather Index
Excellent
9 / 10
Pet Walking Index
Excellent
10 / 10
Fishing Conditions Index
Excellent
10 / 10
Gardening Weather Index
Excellent
10 / 10
Photography Light Index
Excellent
8 / 10
Driving & Road Safety
Excellent
9 / 10
Construction Work Index
Excellent
8 / 10
Cook County daylight overview ☀️
Tomorrow in Cook County, The sun rises at 06:37 and sets at 18:50, giving a total daylight duration of 12 hours and 13 minutes.
Top locations in Cook County
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More Cook County weather pages
What to wear tomorrow in Cook County? clothing recommendations
Stay comfortably stylish - your tailored guide for tomorrow's Cook County forecast.
Long-sleeve shirt
Long pant
Closed-toe shoes
Light jacket
The weather tomorrow in Cook County - FAQ
What is the maximum temperature for tomorrow in Cook County?
The maximum temperature for tomorrow in Cook County is expected to be 17° degrees. Please dress accordingly to stay comfortable throughout the day.
Will it rain tomorrow in Cook County? 🌧️
Yes, there is a 18% chance of rain in Cook County tomorrow. We recommend carrying an umbrella or rain gear to stay dry.
What will be the wind speed tomorrow in Cook County? 🌀
The wind in Cook County is expected to blow at 19 km/h. This could affect outdoor activities, so plan accordingly.
How should I dress for the weather in Cook County tomorrow?
Given the forecast of 17 °F with a 18% chance of rain, we advise checking our "What to wear tomorrow" section for recommendations. There, you will find tailored advice to help you stay comfortable and prepared for the weather conditions in Cook County tomorrow.
What is the sunrise and sunset time for Cook County tomorrow?
The sun is expected to rise at 06:37 and set at 18:50 in Cook County.
How accurate is the weather forecast Cook County tomorrow? ✅
Cook County weather forecast for tomorrow is based on the most current and sophisticated meteorological models available. While we strive for accuracy, weather conditions can change unexpectedly, so we recommend checking for updates regularly.
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Where is Cook County?Get accurate weather forecasts for Cook County, located at latitude 41.85 and longitude -87.65. Stay updated with localized weather information tailored for Cook County.
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