Excessive Heat Warning — Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Lake, IN, Newton, IN, Jasper, IN, Benton, IN, Porter, IN, Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Lake, IL, DuPage, IL, Kankakee, IL, Iroquois, IL, Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL 9:00 PM Beach Hazards Statement — Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN 10:00 AM

Lake County, Illinois, United States

Last updated: 7:56 PM CDT  ·  Refresh
26°C
Feels like 26°
Drizzle
▲ 29°  /  ▼ 20°
Wind
12 mph SSW
Humidity
79%
Dew Point
22°
Pressure
28.86 inHg
Visibility
10 mi
UV Index
0.7
Cloud Cover
55%
Sunrise
5:39 AM
Sunset
8:16 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lake County is currently drizzle at 25°C. Precipitation is likely — peak probability 69% around 8 PM. Atmospheric instability is elevated (CAPE up to 1555 J/kg) — isolated convective development possible. Sunrise: 5:39AM · Sunset: 8:16PM.

Alerts

Excessive Heat Warning
Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Lake, IN, Newton, IN, Jasper, IN, Benton, IN, Porter, IN, Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Lake, IL, DuPage, IL, Kankakee, IL, Iroquois, IL, Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL
Expires 9:00 PM
Beach Hazards Statement
Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN
Expires 10:00 AM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
50%
8 PM
26°
69%
9 PM
26°
48%
10 PM
26°
29%
11 PM
25°
19%
12 AM
24°
10%
1 AM
23°
6%
2 AM
22°
3%
3 AM
21°
3%
4 AM
21°
3%
5 AM
20°
6%
6 AM
20°
6%
7 AM
21°
7%
8 AM
23°
3%
9 AM
24°
3%
10 AM
26°
3%
11 AM
26°
3%
12 PM
26°
3%
1 PM
26°
3%
2 PM
24°
3%
3 PM
24°
3%
4 PM
25°
3%
5 PM
24°
3%
6 PM
23°
3%
7-Day Forecast
Tonight
29° 20°
Drizzle, 50% chance.
Tue
26° 18°
Mostly Clear.
Wed
28° 17°
Clear.
Thu
31° 19°
Partly Cloudy with a 25% chance of rain.
Fri
26° 19°
Rain, 64% chance.
Sat
29° 18°
Drizzle, 69% chance.
Sun
27° 17°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Drizzle 50% 12 mph SSW 79%
8 PM 26° Mostly Clear 69% 9 mph SW 86%
9 PM 26° Clear 48% 11 mph SW 90%
10 PM 26° Mostly Clear 29% 8 mph W 90%
11 PM 25° Mostly Clear 19% 9 mph NW 90%
12 AM 24° Mostly Cloudy 10% 11 mph NNW 92%
1 AM 23° Partly Cloudy 6% 13 mph N 92%
2 AM 22° Mostly Cloudy 3% 13 mph N 92%
3 AM 21° Mostly Cloudy 3% 13 mph N 94%
4 AM 21° Mostly Cloudy 3% 12 mph N 93%
5 AM 20° Mostly Cloudy 6% 11 mph N 91%
6 AM 20° Mostly Cloudy 6% 11 mph N 90%
7 AM 21° Partly Cloudy 7% 12 mph N 83%
8 AM 23° Partly Cloudy 3% 12 mph N 77%
9 AM 24° Partly Cloudy 3% 13 mph N 70%
10 AM 26° Mostly Clear 3% 14 mph N 65%
11 AM 26° Mostly Clear 3% 14 mph NNE 61%
12 PM 26° Clear 3% 14 mph NNE 56%
1 PM 26° Clear 3% 14 mph N 52%
2 PM 24° Clear 3% 14 mph N 48%
3 PM 24° Clear 3% 14 mph N 45%
4 PM 25° Clear 3% 14 mph N 48%
5 PM 24° Clear 3% 12 mph NNE 52%
6 PM 23° Clear 3% 12 mph NNE 55%
15-Day Forecast
Today
7/27
Drizzle
50%
20°
29°
Tue
7/28
Mostly Clear
7%
18°
26°
Wed
7/29
Clear
7%
17°
28°
Thu
7/30
Partly Cloudy
25%
19°
31°
Fri
7/31
Rain
64%
19°
26°
Sat
8/1
Drizzle
69%
18°
29°
Sun
8/2
Clear
17%
17°
27°
Mon
8/3
Clear
8%
17°
28°
Tue
8/4
Drizzle
44%
19°
31°
Wed
8/5
Drizzle
44%
20°
32°
Thu
8/6
Drizzle
60%
19°
29°
Fri
8/7
Drizzle
60%
20°
29°
Sat
8/8
Rain
90%
19°
28°
Sun
8/9
Clear
60%
19°
28°
Mon
8/10
Drizzle
60%
19°
28°
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 9.7 µg/m³
O3
Ground-level ozone
44 AQI 48 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 44 52
Wed 29 Good 29 23
Thu 44 Good 44 39
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 Mon Jul 27, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1125 J/kg
MLCAPE1657 J/kg
MUCAPE3483 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.1
Kinematics
0–6 km Shear58 kt
0–1 km Shear21 kt
Eff. Shear56 kt
0–1 km SRH142
0–3 km SRH68
Eff. SRH68
Storm Motion280° @ 36 kt
0–1 km EHI1.0
Composite Parameters
Sig. Tornado1.7
STP (eff)0.8
Supercell6.8
K-Index8.4
Thermo & Levels
PWAT1.53 in
0–3 km LR4.3 °C/km
700–500 LR6.9 °C/km
Total Totals53.8
LCL937 hPa
LFC977 hPa
EL228 hPa
Freezing Lvl15,791 ft