Cook County, Illinois, United States

Last updated: 5:05 PM CDT · Refresh

24°C

Feels like 27°

Thunderstorm

▲ 28° / ▼ 18°

Wind

7 mph NNW

Humidity

92%

Dew Point

22°

Pressure

29.33 inHg

Visibility

10 mi

UV Index

2.1

Cloud Cover

97%

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 thunderstorm at 24°C. Precipitation is likely — peak probability 69% around 6 PM. Atmospheric instability is elevated (CAPE up to 748 J/kg) — isolated convective development possible. Sunrise: 5:21AM · Sunset: 8:29PM.

52 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

24°

67%

6 PM

23°

68%

7 PM

23°

65%

8 PM

23°

39%

9 PM

22°

28%

10 PM

22°

30%

11 PM

21°

32%

12 AM

21°

24%

1 AM

21°

11%

2 AM

21°

14%

3 AM

21°

23%

4 AM

21°

12%

5 AM

18°

12%

6 AM

18°

21%

7 AM

19°

21%

8 AM

19°

21%

9 AM

20°

13%

10 AM

21°

13%

11 AM

21°

13%

12 PM

23°

1 PM

24°

2 PM

24°

3 PM

24°

4 PM

24°

10%

7-Day Forecast

Today

28° 18°

Thunderstorm, 67% chance.

Sun

25° 18°

Mostly Cloudy with a 21% chance of rain.

Mon

26° 19°

Mostly Clear.

Tue

28° 18°

Partly Cloudy.

Wed

28° 20°

Mostly Clear with a 51% chance of rain.

Thu

26° 21°

Rain, 71% chance.

Fri

25° 19°

Clear with a 53% chance of rain.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 24° Thunderstorm 67% 7 mph NNW 92%

6 PM 23° Rain 68% 5 mph NNE 92%

7 PM 23° Rain 65% 6 mph ENE 92%

8 PM 23° Overcast 39% 4 mph NE 93%

9 PM 22° Overcast 28% 3 mph NE 94%

10 PM 22° Overcast 30% 4 mph NNE 95%

11 PM 21° Overcast 32% 4 mph NNE 95%

12 AM 21° Overcast 24% 5 mph N 96%

1 AM 21° Overcast 11% 4 mph N 96%

2 AM 21° Overcast 14% 4 mph N 95%

3 AM 21° Mostly Cloudy 23% 4 mph NNW 94%

4 AM 21° Mostly Cloudy 12% 4 mph NNW 92%

5 AM 18° Mostly Cloudy 12% 4 mph NNW 90%

6 AM 18° Haze 21% 5 mph NNW 89%

7 AM 19° Fog 21% 5 mph NNW 87%

8 AM 19° Overcast 21% 5 mph N 84%

9 AM 20° Mostly Cloudy 13% 6 mph N 82%

10 AM 21° Mostly Cloudy 13% 6 mph NNE 80%

11 AM 21° Mostly Cloudy 13% 7 mph NNE 78%

12 PM 23° Overcast 9% 8 mph NNE 77%

1 PM 24° Overcast 9% 8 mph NNE 75%

2 PM 24° Mostly Cloudy 9% 8 mph NNE 73%

3 PM 24° Mostly Cloudy 9% 8 mph NNE 71%

4 PM 24° Partly Cloudy 10% 9 mph NNE 69%

15-Day Forecast

Today

7/4

Thunderstorm

67%

18°

28°

Sun

7/5

Mostly Cloudy

21%

18°

25°

Mon

7/6

Mostly Clear

19°

26°

Tue

7/7

Partly Cloudy

18°

28°

Wed

7/8

Mostly Clear

51%

20°

28°

Thu

7/9

Rain

71%

21°

26°

Fri

7/10

Clear

53%

19°

25°

Sat

7/11

Rain

69%

19°

27°

Sun

7/12

Clear

44%

17°

24°

Mon

7/13

Partly Cloudy

44%

19°

26°

Tue

7/14

Drizzle

60%

18°

25°

Wed

7/15

Drizzle

60%

19°

26°

Thu

7/16

Drizzle

60%

19°

25°

Fri

7/17

Drizzle

60%

19°

25°

Sat

7/18

Drizzle

60%

20°

26°

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

PM_2.5

Fine particulate matter

Dominant

52 AQI 9.8 µg/m³

O₃

Ground-level ozone

39 AQI 43 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Sun 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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Sat Jul 4, 20:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE936 J/kg

MLCAPE740 J/kg

MUCAPE936 J/kg

SBCIN0 J/kg

MLCIN0 J/kg

Lifted Index-2.4

Kinematics

0–6 km Shear13 kt

0–1 km Shear7 kt

Eff. Shear13 kt

0–1 km SRH14

0–3 km SRH-1

Eff. SRH-1

Storm Motion174° @ 18 kt

0–1 km EHI0.1

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index34.2

Thermo & Levels

PWAT2.06 in

0–3 km LR5.9 °C/km

700–500 LR4.8 °C/km

Total Totals43.2

LCL962 hPa

LFC993 hPa

EL196 hPa

Freezing Lvl13,655 ft

Cook County, Illinois, United States

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