Excessive Heat Watch 10:00 PM Heat Advisory — Lake, IN, Porter, IN, Newton, IN, Jasper, IN, Benton, IN, Northern Cook, IL, Central Cook, IL, Southern Cook, IL 10:00 PM Excessive Heat Warning — Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Lake, IN, Porter, IN, Newton, IN, Jasper, IN, Benton, IN 12:00 AM

Chicago, Illinois

Last updated: 3:41 PM CDT  ·  Refresh
34°C
Feels like 40°
Mostly Clear
▲ 34°  /  ▼ 24°
Wind
14 mph SW
Humidity
51%
Dew Point
24°
Pressure
29.24 inHg
Visibility
10 mi
UV Index
8.3
Cloud Cover
11%
Sunrise
5:19 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Chicago is currently mostly clear at 34°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3325 J/kg) — isolated convective development possible. Sunrise: 5:19AM · Sunset: 8:30PM.

Alerts

Excessive Heat Watch
Expires 10:00 PM
Heat Advisory
Lake, IN, Porter, IN, Newton, IN, Jasper, IN, Benton, IN, Northern Cook, IL, Central Cook, IL, Southern Cook, IL
Expires 10:00 PM
Excessive Heat Warning
Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Lake, IN, Porter, IN, Newton, IN, Jasper, IN, Benton, IN
Expires 12:00 AM
73 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
34°
3%
4 PM
34°
3%
5 PM
34°
3%
6 PM
34°
3%
7 PM
32°
3%
8 PM
31°
3%
9 PM
30°
3%
10 PM
29°
3%
11 PM
29°
3%
12 AM
28°
3%
1 AM
27°
3%
2 AM
27°
3%
3 AM
26°
3%
4 AM
26°
3%
5 AM
24°
3%
6 AM
24°
3%
7 AM
26°
3%
8 AM
27°
3%
9 AM
28°
3%
10 AM
31°
3%
11 AM
32°
3%
12 PM
32°
3%
1 PM
33°
3%
2 PM
33°
3%
7-Day Forecast
Today
34° 24°
Clear.
Wed
35° 24°
Clear.
Thu
37° 26°
Clear.
Fri
36° 24°
Clear with a 71% chance of rain.
Sat
32° 19°
Drizzle, 60% chance.
Sun
31° 19°
Drizzle, 60% chance.
Mon
29° 19°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 34° Mostly Clear 3% 14 mph SW 51%
4 PM 34° Clear 3% 16 mph SSW 52%
5 PM 34° Clear 3% 16 mph SW 54%
6 PM 34° Clear 3% 15 mph SW 57%
7 PM 32° Clear 3% 13 mph SW 62%
8 PM 31° Clear 3% 11 mph SW 66%
9 PM 30° Clear 3% 10 mph SW 70%
10 PM 29° Clear 3% 9 mph SW 73%
11 PM 29° Clear 3% 9 mph SW 75%
12 AM 28° Clear 3% 8 mph SW 78%
1 AM 27° Clear 3% 8 mph SW 80%
2 AM 27° Clear 3% 8 mph SW 81%
3 AM 26° Clear 3% 8 mph SW 83%
4 AM 26° Clear 3% 8 mph SW 83%
5 AM 24° Clear 3% 8 mph SW 82%
6 AM 24° Clear 3% 8 mph SW 80%
7 AM 26° Clear 3% 9 mph SW 73%
8 AM 27° Clear 3% 10 mph SW 65%
9 AM 28° Clear 3% 10 mph WSW 58%
10 AM 31° Clear 3% 10 mph SW 55%
11 AM 32° Clear 3% 10 mph SW 52%
12 PM 32° Clear 3% 11 mph SW 50%
1 PM 33° Clear 3% 12 mph SW 49%
2 PM 33° Clear 3% 12 mph SW 49%
15-Day Forecast
Today
6/30
Clear
3%
24°
34°
Wed
7/1
Clear
7%
24°
35°
Thu
7/2
Clear
16%
26°
37°
Fri
7/3
Clear
71%
24°
36°
Sat
7/4
Drizzle
60%
19°
32°
Sun
7/5
Drizzle
60%
19°
31°
Mon
7/6
Clear
19%
19°
29°
Tue
7/7
Clear
60%
22°
31°
Wed
7/8
Drizzle
60%
22°
32°
Thu
7/9
Drizzle
60%
19°
30°
Fri
7/10
Drizzle
60%
18°
28°
Sat
7/11
Drizzle
60%
21°
27°
Sun
7/12
Drizzle
60%
21°
27°
Mon
7/13
Drizzle
60%
20°
27°
Tue
7/14
Drizzle
60%
19°
26°
73
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
73 AQI 20.9 µg/m³
O3
Ground-level ozone
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 73 Moderate 38 73
Thu 69 Moderate 40 69
Fri 48 Good 35 48
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 Jun 30, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE4086 J/kg
MLCAPE3232 J/kg
MUCAPE4086 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.0
Kinematics
0–6 km Shear21 kt
0–1 km Shear7 kt
Eff. Shear20 kt
0–1 km SRH6
0–3 km SRH-63
Eff. SRH-63
Storm Motion224° @ 36 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index21.8
Thermo & Levels
PWAT1.54 in
0–3 km LR7.3 °C/km
700–500 LR6.3 °C/km
Total Totals46.6
LCL846 hPa
LFC990 hPa
EL139 hPa
Freezing Lvl16,175 ft