Severe Thunderstorm Watch 10:00 PM Severe Thunderstorm Watch 10:00 PM

DuPage County, Illinois, United States

Last updated: 9:11 PM CDT  ·  Refresh
22°C
Feels like 23°
Mostly Cloudy
▲ 26°  /  ▼ 16°
Wind
7 mph SW
Humidity
92%
Dew Point
19°
Pressure
29.14 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
81%
Sunrise
6:06 AM
Sunset
7:43 PM
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WeatherAI™ Analysis

WeatherAI Analysis: DuPage County is currently mostly cloudy at 22°C. Precipitation is likely — peak probability 59% around 9 PM. Atmospheric instability is elevated (CAPE up to 1251 J/kg) — isolated convective development possible. Sunrise: 6:06AM · Sunset: 7:43PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
58 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
59%
10 PM
21°
58%
11 PM
21°
58%
12 AM
21°
19%
1 AM
19°
3%
2 AM
19°
3%
3 AM
19°
6%
4 AM
19°
6%
5 AM
18°
6%
6 AM
17°
3%
7 AM
17°
3%
8 AM
18°
5%
9 AM
20°
5%
10 AM
22°
5%
11 AM
23°
5%
12 PM
24°
8%
1 PM
26°
16%
2 PM
26°
16%
3 PM
27°
16%
4 PM
27°
16%
5 PM
27°
5%
6 PM
26°
3%
7 PM
26°
3%
8 PM
24°
3%
7-Day Forecast
Tonight
26° 16°
Mostly Cloudy with a 59% chance of rain.
Sat
27° 17°
Partly Cloudy.
Sun
25° 15°
Partly Cloudy.
Mon
24° 12°
Mostly Cloudy with a 37% chance of rain.
Tue
26° 15°
Clear with a 64% chance of rain.
Wed
28° 15°
Thunderstorm, 64% chance.
Thu
29° 17°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Mostly Cloudy 59% 7 mph SW 92%
10 PM 21° Overcast 58% 8 mph WSW 93%
11 PM 21° Mostly Cloudy 58% 6 mph WSW 94%
12 AM 21° Mostly Cloudy 19% 6 mph WSW 95%
1 AM 19° Partly Cloudy 3% 5 mph W 95%
2 AM 19° Partly Cloudy 3% 5 mph W 95%
3 AM 19° Partly Cloudy 6% 6 mph WNW 95%
4 AM 19° Partly Cloudy 6% 6 mph WNW 95%
5 AM 18° Partly Cloudy 6% 7 mph NW 94%
6 AM 17° Partly Cloudy 3% 8 mph NW 92%
7 AM 17° Partly Cloudy 3% 8 mph NW 90%
8 AM 18° Partly Cloudy 5% 10 mph NNW 84%
9 AM 20° Partly Cloudy 5% 10 mph NW 77%
10 AM 22° Partly Cloudy 5% 10 mph NW 70%
11 AM 23° Partly Cloudy 5% 10 mph NW 66%
12 PM 24° Partly Cloudy 8% 10 mph NW 60%
1 PM 26° Partly Cloudy 16% 11 mph NW 56%
2 PM 26° Partly Cloudy 16% 11 mph NW 56%
3 PM 27° Partly Cloudy 16% 11 mph NW 56%
4 PM 27° Mostly Clear 16% 11 mph NW 55%
5 PM 27° Mostly Clear 5% 10 mph NW 57%
6 PM 26° Mostly Clear 3% 10 mph NW 59%
7 PM 26° Mostly Clear 3% 9 mph NW 59%
8 PM 24° Mostly Clear 3% 9 mph NW 62%
15-Day Forecast
Today
8/21
Mostly Cloudy
59%
16°
26°
Sat
8/22
Partly Cloudy
19%
17°
27°
Sun
8/23
Partly Cloudy
3%
15°
25°
Mon
8/24
Mostly Cloudy
37%
12°
24°
Tue
8/25
Clear
64%
15°
26°
Wed
8/26
Thunderstorm
64%
15°
28°
Thu
8/27
Drizzle
52%
17°
29°
Fri
8/28
Clear
31%
19°
29°
Sat
8/29
Drizzle
68%
18°
29°
Sun
8/30
Rain
68%
21°
28°
Mon
8/31
Drizzle
60%
21°
32°
Tue
9/1
Drizzle
60%
21°
32°
Wed
9/2
Drizzle
60%
20°
28°
Thu
9/3
Drizzle
60%
19°
27°
Fri
9/4
Drizzle
60%
19°
28°
58
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
58 AQI 12.7 µg/m³
O3
Ground-level ozone
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 58 Moderate 38 58
Sun 31 Good 31 26
Mon 25 Good 25 14
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 Fri Aug 21, 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
SBCAPE1238 J/kg
MLCAPE1475 J/kg
MUCAPE1653 J/kg
SBCIN-63 J/kg
MLCIN-23 J/kg
Lifted Index-3.8
Kinematics
0–6 km Shear33 kt
0–1 km Shear16 kt
Eff. Shear32 kt
0–1 km SRH81
0–3 km SRH139
Eff. SRH139
Storm Motion338° @ 16 kt
0–1 km EHI0.6
Composite Parameters
Sig. Tornado0.4
STP (eff)0.7
Supercell3.7
K-Index34.9
Thermo & Levels
PWAT1.71 in
0–3 km LR5.5 °C/km
700–500 LR6.5 °C/km
Total Totals52.4
LCL954 hPa
LFC824 hPa
EL224 hPa
Freezing Lvl12,152 ft