Severe Thunderstorm Watch 7:00 PM Flash Flood Warning — Kendall County, IL, Will County, IL 6:45 PM Heat Advisory — Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Kankakee, IL, Iroquois, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL, Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Porter, IN, Lake, IN, Newton, IN, Jasper, IN, Benton, IN 9:00 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

Will County, Illinois, United States

Last updated: 6:06 PM CDT  ·  Refresh
26°C
Feels like 26°
Heavy Rain
▲ 29°  /  ▼ 21°
Wind
12 mph SW
Humidity
80%
Dew Point
23°
Pressure
29.01 inHg
Visibility
0 mi
UV Index
3.9
Cloud Cover
65%
Sunrise
5:42 AM
Sunset
8:14 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Will County is currently heavy rain at 26°C. Precipitation is likely — peak probability 54% around 7 PM. Atmospheric instability is elevated (CAPE up to 1876 J/kg) — isolated convective development possible. Sunrise: 5:42AM · Sunset: 8:14PM.

Alerts

Severe Thunderstorm Watch
Expires 7:00 PM
Flash Flood Warning
Kendall County, IL, Will County, IL
Expires 6:45 PM
Heat Advisory
Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Kankakee, IL, Iroquois, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL, Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Porter, IN, Lake, IN, Newton, IN, Jasper, IN, Benton, IN
Expires 9:00 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
44 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
44%
7 PM
27°
53%
8 PM
26°
35%
9 PM
26°
35%
10 PM
26°
51%
11 PM
26°
33%
12 AM
25°
30%
1 AM
24°
6%
2 AM
23°
4%
3 AM
23°
4%
4 AM
23°
4%
5 AM
22°
4%
6 AM
21°
6%
7 AM
21°
6%
8 AM
21°
6%
9 AM
22°
3%
10 AM
23°
3%
11 AM
24°
3%
12 PM
24°
3%
1 PM
24°
3%
2 PM
24°
3%
3 PM
24°
3%
4 PM
24°
3%
5 PM
26°
3%
7-Day Forecast
Tonight
29° 21°
Heavy Rain, 44% chance.
Tue
26° 18°
Partly Cloudy with a 30% chance of rain.
Wed
29° 16°
Clear.
Thu
28° 18°
Mostly Clear with a 45% chance of rain.
Fri
23° 18°
Rain, 57% chance.
Sat
24° 18°
Rain, 83% chance.
Sun
26° 18°
Clear with a 33% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Heavy Rain 44% 12 mph SW 80%
7 PM 27° Mostly Clear 53% 11 mph SSW 79%
8 PM 26° Partly Cloudy 35% 10 mph SSW 81%
9 PM 26° Partly Cloudy 35% 10 mph SW 82%
10 PM 26° Partly Cloudy 51% 9 mph WSW 84%
11 PM 26° Mostly Clear 33% 8 mph WSW 86%
12 AM 25° Mostly Clear 30% 7 mph W 87%
1 AM 24° Mostly Clear 6% 7 mph WNW 87%
2 AM 23° Mostly Clear 4% 7 mph NW 87%
3 AM 23° Partly Cloudy 4% 9 mph N 91%
4 AM 23° Mostly Cloudy 4% 12 mph N 93%
5 AM 22° Mostly Cloudy 4% 12 mph N 93%
6 AM 21° Mostly Cloudy 6% 12 mph N 92%
7 AM 21° Mostly Cloudy 6% 12 mph N 92%
8 AM 21° Mostly Cloudy 6% 12 mph N 87%
9 AM 22° Mostly Cloudy 3% 12 mph N 83%
10 AM 23° Mostly Cloudy 3% 12 mph N 79%
11 AM 24° Partly Cloudy 3% 12 mph N 74%
12 PM 24° Partly Cloudy 3% 12 mph NNE 70%
1 PM 24° Partly Cloudy 3% 12 mph NNE 66%
2 PM 24° Partly Cloudy 3% 12 mph NNE 64%
3 PM 24° Partly Cloudy 3% 12 mph NNE 62%
4 PM 24° Mostly Clear 3% 12 mph NNE 61%
5 PM 26° Clear 3% 11 mph NNE 62%
15-Day Forecast
Today
7/27
Heavy Rain
44%
21°
29°
Tue
7/28
Partly Cloudy
30%
18°
26°
Wed
7/29
Clear
6%
16°
29°
Thu
7/30
Mostly Clear
45%
18°
28°
Fri
7/31
Rain
57%
18°
23°
Sat
8/1
Rain
83%
18°
24°
Sun
8/2
Clear
33%
18°
26°
Mon
8/3
Clear
27%
18°
27°
Tue
8/4
Thunderstorm
47%
19°
28°
Wed
8/5
Rain
66%
19°
26°
Thu
8/6
Drizzle
67%
17°
26°
Fri
8/7
Drizzle
60%
20°
26°
Sat
8/8
Rain
90%
20°
26°
Sun
8/9
Drizzle
60%
20°
25°
Mon
8/10
Drizzle
60%
19°
26°
44
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
44 AQI 8.0 µg/m³
O3
Ground-level ozone
35 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 44 Good 35 44
Wed 36 Good 36 32
Thu 47 Good 47 43
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 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1406 J/kg
MLCAPE2116 J/kg
MUCAPE2651 J/kg
SBCIN-312 J/kg
MLCIN0 J/kg
Lifted Index-4.4
Kinematics
0–6 km Shear47 kt
0–1 km Shear26 kt
Eff. Shear62 kt
0–1 km SRH275
0–3 km SRH289
Eff. SRH91
Storm Motion276° @ 38 kt
0–1 km EHI2.4
Composite Parameters
Sig. Tornado3.4
STP (eff)0.0
Supercell7.7
K-Index34.1
Thermo & Levels
PWAT1.89 in
0–3 km LR4.3 °C/km
700–500 LR6.9 °C/km
Total Totals51.4
LCL946 hPa
LFC663 hPa
EL208 hPa
Freezing Lvl15,682 ft