Areal Flood Warning — Cook County, IL, De Kalb County, IL, DuPage County, IL, Kane County, IL 11:00 AM Areal Flood Warning — Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL 2:00 PM Flood Warning — Cook County, IL 8:12 PM

Cook County, Illinois, United States

Last updated: 11:25 PM CDT  ·  Refresh
21°C
Feels like 22°
Mostly Cloudy
▲ 28°  /  ▼ 18°
Wind
6 mph NNE
Humidity
97%
Dew Point
20°
Pressure
29.29 inHg
Visibility
4 mi
UV Index
0.0
Cloud Cover
77%
Sunrise
5:21 AM
Sunset
8:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Cook County is currently mostly cloudy at 21°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:21AM · Sunset: 8:29PM.

Alerts

Areal Flood Warning
Cook County, IL, De Kalb County, IL, DuPage County, IL, Kane County, IL
Expires 11:00 AM
Areal Flood Warning
Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL
Expires 2:00 PM
Flood Warning
Cook County, IL
Expires 8:12 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
43%
12 AM
21°
36%
1 AM
21°
26%
2 AM
21°
27%
3 AM
21°
29%
4 AM
21°
18%
5 AM
18°
20%
6 AM
18°
20%
7 AM
19°
20%
8 AM
19°
23%
9 AM
19°
32%
10 AM
20°
36%
11 AM
21°
36%
12 PM
21°
41%
1 PM
22°
49%
2 PM
22°
36%
3 PM
21°
38%
4 PM
21°
39%
5 PM
23°
31%
6 PM
22°
22%
7 PM
21°
22%
8 PM
21°
21%
9 PM
20°
20%
10 PM
19°
23%
7-Day Forecast
Tonight
28° 18°
Mostly Cloudy with a 43% chance of rain.
Sun
23° 18°
Mostly Cloudy with a 36% chance of rain.
Mon
24° 19°
Clear.
Tue
28° 17°
Mostly Clear.
Wed
28° 17°
Rain, 72% chance.
Thu
23° 18°
Rain, 71% chance.
Fri
24° 17°
Clear with a 52% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 43% 6 mph NNE 97%
12 AM 21° Mostly Cloudy 36% 5 mph NNE 96%
1 AM 21° Mostly Cloudy 26% 4 mph NNE 96%
2 AM 21° Overcast 27% 3 mph NNW 94%
3 AM 21° Overcast 29% 4 mph NNW 94%
4 AM 21° Overcast 18% 4 mph NNW 93%
5 AM 18° Overcast 20% 5 mph NNW 92%
6 AM 18° Overcast 20% 5 mph NNW 91%
7 AM 19° Overcast 20% 6 mph N 90%
8 AM 19° Mostly Cloudy 23% 6 mph N 90%
9 AM 19° Mostly Cloudy 32% 7 mph N 89%
10 AM 20° Mostly Cloudy 36% 7 mph N 89%
11 AM 21° Mostly Cloudy 36% 8 mph N 88%
12 PM 21° Mostly Cloudy 41% 8 mph N 86%
1 PM 22° Mostly Cloudy 49% 9 mph NNE 86%
2 PM 22° Mostly Cloudy 36% 9 mph NNE 86%
3 PM 21° Mostly Cloudy 38% 10 mph NNE 86%
4 PM 21° Mostly Cloudy 39% 10 mph NNE 85%
5 PM 23° Mostly Cloudy 31% 10 mph NNE 84%
6 PM 22° Partly Cloudy 22% 10 mph NNE 82%
7 PM 21° Partly Cloudy 22% 10 mph NNE 82%
8 PM 21° Partly Cloudy 21% 9 mph NNE 82%
9 PM 20° Partly Cloudy 20% 9 mph NNE 82%
10 PM 19° Partly Cloudy 23% 8 mph NNE 84%
15-Day Forecast
Today
7/4
Mostly Cloudy
43%
18°
28°
Sun
7/5
Mostly Cloudy
36%
18°
23°
Mon
7/6
Clear
6%
19°
24°
Tue
7/7
Mostly Clear
5%
17°
28°
Wed
7/8
Rain
72%
17°
28°
Thu
7/9
Rain
71%
18°
23°
Fri
7/10
Clear
52%
17°
24°
Sat
7/11
Clear
53%
17°
25°
Sun
7/12
Drizzle
43%
17°
26°
Mon
7/13
Clear
44%
16°
27°
Tue
7/14
Clear
60%
19°
28°
Wed
7/15
Drizzle
60%
21°
27°
Thu
7/16
Drizzle
60%
21°
26°
Fri
7/17
Drizzle
60%
21°
26°
Sat
7/18
Drizzle
60%
21°
27°
52
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
52 AQI 9.8 µg/m³
O3
Ground-level ozone
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 39 52
Mon 39 Good 38 39
Tue 51 Moderate 34 51
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Jul 5, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1 J/kg
MLCAPE76 J/kg
MUCAPE127 J/kg
SBCIN-94 J/kg
MLCIN0 J/kg
Lifted Index1.5
Kinematics
0–6 km Shear17 kt
0–1 km Shear7 kt
Eff. Shear13 kt
0–1 km SRH44
0–3 km SRH48
Eff. SRH9
Storm Motion142° @ 17 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.2
Thermo & Levels
PWAT2.03 in
0–3 km LR4.6 °C/km
700–500 LR4.9 °C/km
Total Totals42.8
LCL983 hPa
LFC732 hPa
EL690 hPa
Freezing Lvl14,137 ft