Flood Warning — Cook County, IL, Lake County, IN 10:00 AM Flood Warning — Cook County, IL 2:51 PM Beach Hazards Statement — Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN 10:00 AM

Chicago, Illinois

Last updated: 9:30 PM CDT  ·  Refresh
24°C
Feels like 27°
Rain
▲ 27°  /  ▼ 21°
Wind
10 mph SSW
Humidity
89%
Dew Point
23°
Pressure
29.02 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
33%
Sunrise
5:39 AM
Sunset
8:14 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Chicago is currently rain at 25°C. Precipitation is likely — peak probability 57% around 10 PM. Atmospheric instability is elevated (CAPE up to 1860 J/kg) — isolated convective development possible. Sunrise: 5:39AM · Sunset: 8:14PM.

Alerts

Flood Warning
Cook County, IL, Lake County, IN
Expires 10:00 AM
Flood Warning
Cook County, IL
Expires 2:51 PM
Beach Hazards Statement
Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN
Expires 10:00 AM
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
50%
10 PM
26°
56%
11 PM
26°
37%
12 AM
26°
14%
1 AM
25°
3%
2 AM
24°
5%
3 AM
23°
6%
4 AM
23°
6%
5 AM
21°
6%
6 AM
21°
16%
7 AM
21°
16%
8 AM
21°
3%
9 AM
22°
3%
10 AM
22°
3%
11 AM
22°
3%
12 PM
23°
3%
1 PM
20°
3%
2 PM
20°
3%
3 PM
21°
3%
4 PM
20°
3%
5 PM
22°
3%
6 PM
21°
3%
7 PM
21°
3%
8 PM
21°
3%
7-Day Forecast
Tonight
27° 21°
Rain, 50% chance.
Tue
26° 20°
Partly Cloudy.
Wed
27° 21°
Clear.
Thu
28° 22°
Partly Cloudy.
Fri
25° 18°
Clear with a 64% chance of rain.
Sat
26° 19°
Rain, 69% chance.
Sun
25° 21°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 24° Rain 50% 10 mph SSW 89%
10 PM 26° Rain 56% 9 mph SW 87%
11 PM 26° Mostly Clear 37% 9 mph WSW 82%
12 AM 26° Clear 14% 9 mph W 77%
1 AM 25° Mostly Clear 3% 9 mph NW 77%
2 AM 24° Partly Cloudy 5% 13 mph NNW 82%
3 AM 23° Mostly Cloudy 6% 16 mph N 87%
4 AM 23° Overcast 6% 16 mph N 89%
5 AM 21° Overcast 6% 16 mph N 89%
6 AM 21° Overcast 16% 15 mph N 88%
7 AM 21° Mostly Cloudy 16% 15 mph N 87%
8 AM 21° Overcast 3% 15 mph N 83%
9 AM 22° Overcast 3% 15 mph N 80%
10 AM 22° Mostly Cloudy 3% 15 mph N 78%
11 AM 22° Mostly Cloudy 3% 15 mph N 76%
12 PM 23° Partly Cloudy 3% 15 mph N 74%
1 PM 20° Mostly Clear 3% 15 mph N 70%
2 PM 20° Mostly Clear 3% 15 mph N 65%
3 PM 21° Mostly Clear 3% 16 mph N 60%
4 PM 20° Mostly Clear 3% 16 mph N 58%
5 PM 22° Mostly Clear 3% 16 mph N 59%
6 PM 21° Mostly Clear 3% 16 mph N 60%
7 PM 21° Mostly Clear 3% 16 mph N 61%
8 PM 21° Partly Cloudy 3% 15 mph N 63%
15-Day Forecast
Today
7/27
Rain
50%
21°
27°
Tue
7/28
Partly Cloudy
16%
20°
26°
Wed
7/29
Clear
7%
21°
27°
Thu
7/30
Partly Cloudy
17%
22°
28°
Fri
7/31
Clear
64%
18°
25°
Sat
8/1
Rain
69%
19°
26°
Sun
8/2
Clear
17%
21°
25°
Mon
8/3
Clear
8%
19°
26°
Tue
8/4
Drizzle
44%
21°
28°
Wed
8/5
Drizzle
66%
22°
29°
Thu
8/6
Rain
64%
22°
28°
Fri
8/7
Drizzle
60%
21°
28°
Sat
8/8
Drizzle
60%
21°
24°
Sun
8/9
Drizzle
60%
22°
24°
Mon
8/10
Drizzle
60%
21°
24°
54
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
54 AQI 10.9 µg/m³
O3
Ground-level ozone
45 AQI 49 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 45 54
Wed 35 Good 35 17
Thu 31 Good 31 23
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 Tue Jul 28, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE992 J/kg
MLCAPE1778 J/kg
MUCAPE3189 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.0
Kinematics
0–6 km Shear53 kt
0–1 km Shear24 kt
Eff. Shear57 kt
0–1 km SRH223
0–3 km SRH145
Eff. SRH145
Storm Motion280° @ 35 kt
0–1 km EHI1.4
Composite Parameters
Sig. Tornado2.4
STP (eff)1.7
Supercell13.6
K-Index22.7
Thermo & Levels
PWAT1.60 in
0–3 km LR4.2 °C/km
700–500 LR6.7 °C/km
Total Totals51.0
LCL957 hPa
LFC983 hPa
EL237 hPa
Freezing Lvl16,060 ft