Flash Flood Warning — DuPage County, IL, Will County, IL 9:30 PM Areal Flood Warning — Cook County, IL, De Kalb County, IL, DuPage County, IL, Kane County, IL 11:00 AM Areal Flood Warning — Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL 2:00 PM Flood Warning — DuPage County, IL, Will County, IL 1:00 AM

DuPage County, Illinois, United States

Last updated: 8:22 PM CDT  ·  Refresh
22°C
Feels like 23°
Overcast
▲ 28°  /  ▼ 18°
Wind
7 mph ENE
Humidity
94%
Dew Point
20°
Pressure
29.15 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
88%
Sunrise
5:22 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: DuPage County is currently overcast at 21°C. Precipitation is likely — peak probability 71% around 8 PM. Atmospheric instability is elevated (CAPE up to 583 J/kg) — isolated convective development possible. Sunrise: 5:22AM · Sunset: 8:30PM.

Alerts

Flash Flood Warning
DuPage County, IL, Will County, IL
Expires 9:30 PM
Areal Flood Warning
Cook County, IL, De Kalb County, IL, DuPage County, IL, Kane County, IL
Expires 11:00 AM
Areal Flood Warning
Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL
Expires 2:00 PM
Flood Warning
DuPage County, IL, Will County, IL
Expires 1:00 AM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
70%
9 PM
21°
65%
10 PM
21°
53%
11 PM
21°
52%
12 AM
21°
35%
1 AM
21°
23%
2 AM
20°
23%
3 AM
20°
33%
4 AM
20°
37%
5 AM
18°
37%
6 AM
18°
36%
7 AM
18°
41%
8 AM
19°
36%
9 AM
21°
37%
10 AM
22°
37%
11 AM
22°
37%
12 PM
23°
37%
1 PM
24°
34%
2 PM
24°
34%
3 PM
25°
34%
4 PM
25°
34%
5 PM
24°
34%
6 PM
24°
18%
7 PM
23°
11%
7-Day Forecast
Tonight
28° 18°
Overcast with a 70% chance of rain.
Sun
26° 18°
Mostly Cloudy with a 37% chance of rain.
Mon
26° 18°
Mostly Clear.
Tue
28° 17°
Clear.
Wed
28° 19°
Rain, 72% chance.
Thu
24° 18°
Rain, 82% chance.
Fri
26° 16°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Overcast 70% 7 mph ENE 94%
9 PM 21° Rain 65% 6 mph NE 95%
10 PM 21° Mostly Cloudy 53% 5 mph NE 96%
11 PM 21° Mostly Cloudy 52% 5 mph NE 96%
12 AM 21° Mostly Cloudy 35% 4 mph NNE 97%
1 AM 21° Mostly Cloudy 23% 4 mph N 96%
2 AM 20° Mostly Cloudy 23% 4 mph NNW 95%
3 AM 20° Mostly Cloudy 33% 5 mph NNW 94%
4 AM 20° Mostly Cloudy 37% 5 mph NNW 92%
5 AM 18° Rain 37% 5 mph NNW 91%
6 AM 18° Rain 36% 5 mph NNW 91%
7 AM 18° Overcast 41% 5 mph N 90%
8 AM 19° Overcast 36% 6 mph N 88%
9 AM 21° Mostly Cloudy 37% 6 mph NNE 86%
10 AM 22° Mostly Cloudy 37% 7 mph NNE 84%
11 AM 22° Overcast 37% 8 mph NNE 82%
12 PM 23° Overcast 37% 8 mph NNE 79%
1 PM 24° Overcast 34% 9 mph NNE 77%
2 PM 24° Mostly Cloudy 34% 9 mph NNE 76%
3 PM 25° Mostly Cloudy 34% 9 mph NNE 75%
4 PM 25° Mostly Cloudy 34% 9 mph NNE 75%
5 PM 24° Mostly Cloudy 34% 9 mph NNE 76%
6 PM 24° Mostly Cloudy 18% 9 mph NNE 77%
7 PM 23° Mostly Cloudy 11% 9 mph NNE 79%
15-Day Forecast
Today
7/4
Overcast
70%
18°
28°
Sun
7/5
Mostly Cloudy
37%
18°
26°
Mon
7/6
Mostly Clear
3%
18°
26°
Tue
7/7
Clear
3%
17°
28°
Wed
7/8
Rain
72%
19°
28°
Thu
7/9
Rain
82%
18°
24°
Fri
7/10
Drizzle
52%
16°
26°
Sat
7/11
Clear
53%
18°
26°
Sun
7/12
Drizzle
43%
17°
27°
Mon
7/13
Clear
19%
16°
28°
Tue
7/14
Drizzle
60%
20°
29°
Wed
7/15
Drizzle
60%
21°
29°
Thu
7/16
Drizzle
60%
21°
28°
Fri
7/17
Drizzle
60%
21°
28°
Sat
7/18
Drizzle
60%
21°
29°
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
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 39 52
Mon 46 Good 44 46
Tue 53 Moderate 39 53
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 Sat Jul 4, 23:00'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
SBCAPE91 J/kg
MLCAPE124 J/kg
MUCAPE343 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-0.2
Kinematics
0–6 km Shear27 kt
0–1 km Shear6 kt
Eff. Shear28 kt
0–1 km SRH29
0–3 km SRH-14
Eff. SRH-47
Storm Motion174° @ 13 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.4
Thermo & Levels
PWAT1.95 in
0–3 km LR4.8 °C/km
700–500 LR5.2 °C/km
Total Totals44.5
LCL971 hPa
LFC987 hPa
EL485 hPa
Freezing Lvl13,888 ft