Severe Thunderstorm Watch 7:00 PM 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: 6:06 PM CDT  ·  Refresh
26°C
Feels like 26°
Partly Cloudy
▲ 30°  /  ▼ 20°
Wind
14 mph SSW
Humidity
72%
Dew Point
22°
Pressure
28.88 inHg
Visibility
10 mi
UV Index
4.5
Cloud Cover
46%
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 partly cloudy at 26°C. Precipitation is likely — peak probability 66% around 8 PM. Atmospheric instability is elevated (CAPE up to 2057 J/kg) — isolated convective development possible. Sunrise: 5:39AM · Sunset: 8:16PM.

Alerts

Severe Thunderstorm Watch
Expires 7:00 PM
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°
48%
7 PM
28°
48%
8 PM
28°
66%
9 PM
27°
66%
10 PM
26°
25%
11 PM
26°
25%
12 AM
25°
20%
1 AM
24°
7%
2 AM
23°
8%
3 AM
22°
4%
4 AM
21°
4%
5 AM
21°
14%
6 AM
21°
6%
7 AM
21°
6%
8 AM
22°
6%
9 AM
23°
3%
10 AM
24°
3%
11 AM
25°
3%
12 PM
26°
3%
1 PM
24°
3%
2 PM
24°
3%
3 PM
24°
3%
4 PM
23°
3%
5 PM
26°
3%
7-Day Forecast
Tonight
30° 20°
Partly Cloudy with a 66% chance of rain.
Tue
27° 18°
Partly Cloudy with a 20% chance of rain.
Wed
28° 17°
Clear.
Thu
31° 20°
Mostly Clear with a 41% chance of rain.
Fri
27° 19°
Rain, 57% chance.
Sat
26° 18°
Rain, 83% chance.
Sun
26° 17°
Clear with a 25% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Partly Cloudy 48% 14 mph SSW 72%
7 PM 28° Clear 48% 14 mph SW 71%
8 PM 28° Heavy Rain 66% 11 mph SW 78%
9 PM 27° Partly Cloudy 66% 8 mph WSW 85%
10 PM 26° Mostly Clear 25% 8 mph W 88%
11 PM 26° Mostly Clear 25% 8 mph WNW 89%
12 AM 25° Partly Cloudy 20% 9 mph NNW 92%
1 AM 24° Partly Cloudy 7% 12 mph N 94%
2 AM 23° Partly Cloudy 8% 12 mph N 94%
3 AM 22° Partly Cloudy 4% 12 mph N 95%
4 AM 21° Mostly Cloudy 4% 12 mph N 95%
5 AM 21° Mostly Cloudy 14% 11 mph N 93%
6 AM 21° Partly Cloudy 6% 11 mph N 91%
7 AM 21° Mostly Cloudy 6% 11 mph N 89%
8 AM 22° Mostly Cloudy 6% 11 mph N 83%
9 AM 23° Mostly Cloudy 3% 12 mph N 76%
10 AM 24° Mostly Cloudy 3% 13 mph N 68%
11 AM 25° Partly Cloudy 3% 13 mph NNE 64%
12 PM 26° Partly Cloudy 3% 13 mph NNE 60%
1 PM 24° Mostly Clear 3% 14 mph NNE 56%
2 PM 24° Mostly Clear 3% 14 mph NNE 54%
3 PM 24° Mostly Clear 3% 13 mph N 52%
4 PM 23° Mostly Clear 3% 13 mph N 50%
5 PM 26° Clear 3% 12 mph NNE 53%
15-Day Forecast
Today
7/27
Partly Cloudy
66%
20°
30°
Tue
7/28
Partly Cloudy
20%
18°
27°
Wed
7/29
Clear
6%
17°
28°
Thu
7/30
Mostly Clear
41%
20°
31°
Fri
7/31
Rain
57%
19°
27°
Sat
8/1
Rain
83%
18°
26°
Sun
8/2
Clear
25%
17°
26°
Mon
8/3
Clear
17%
17°
28°
Tue
8/4
Drizzle
47%
20°
31°
Wed
8/5
Rain
66%
19°
28°
Thu
8/6
Drizzle
60%
19°
28°
Fri
8/7
Drizzle
60%
20°
28°
Sat
8/8
Rain
90%
19°
28°
Sun
8/9
Drizzle
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
Tue 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, 21:00'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
SBCAPE1237 J/kg
MLCAPE2133 J/kg
MUCAPE3762 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-3.8
Kinematics
0–6 km Shear54 kt
0–1 km Shear24 kt
Eff. Shear53 kt
0–1 km SRH174
0–3 km SRH145
Eff. SRH145
Storm Motion280° @ 38 kt
0–1 km EHI1.3
Composite Parameters
Sig. Tornado2.0
STP (eff)1.7
Supercell14.8
K-Index21.0
Thermo & Levels
PWAT1.71 in
0–3 km LR4.4 °C/km
700–500 LR7.0 °C/km
Total Totals53.3
LCL926 hPa
LFC978 hPa
EL227 hPa
Freezing Lvl15,732 ft