Excessive Heat Warning — Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 9:00 PM Excessive Heat Watch 7:00 PM

Washington County, Illinois, United States

Last updated: 10:18 AM CDT  ·  Refresh
29°C
Feels like 37°
Partly Cloudy
▲ 36°  /  ▼ 23°
Wind
4 mph S
Humidity
82%
Dew Point
26°
Pressure
29.44 inHg
Visibility
10 mi
UV Index
8.1
Cloud Cover
34%
Sunrise
5:54 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Washington County is currently partly cloudy at 30°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4217 J/kg) — isolated convective development possible. Sunrise: 5:54AM · Sunset: 8:13PM.

Alerts

Excessive Heat Warning
Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 9:00 PM
Excessive Heat Watch
Expires 7:00 PM
50 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
29°
9%
11 AM
31°
26%
12 PM
32°
29%
1 PM
34°
30%
2 PM
34°
28%
3 PM
36°
28%
4 PM
36°
31%
5 PM
36°
20%
6 PM
36°
35%
7 PM
34°
29%
8 PM
33°
33%
9 PM
30°
37%
10 PM
29°
46%
11 PM
28°
47%
12 AM
27°
27%
1 AM
26°
20%
2 AM
26°
20%
3 AM
24°
20%
4 AM
24°
9%
5 AM
24°
9%
6 AM
24°
3%
7 AM
24°
3%
8 AM
26°
3%
9 AM
28°
3%
7-Day Forecast
Today
36° 23°
Partly Cloudy with a 46% chance of rain.
Mon
37° 24°
Clear with a 36% chance of rain.
Tue
34° 21°
Mostly Clear with a 42% chance of rain.
Wed
30° 18°
Clear.
Thu
31° 18°
Clear with a 29% chance of rain.
Fri
27° 19°
Drizzle, 64% chance.
Sat
30° 18°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 29° Partly Cloudy 9% 4 mph S 82%
11 AM 31° Partly Cloudy 26% 5 mph SSW 78%
12 PM 32° Partly Cloudy 29% 7 mph SW 74%
1 PM 34° Partly Cloudy 30% 7 mph SW 70%
2 PM 34° Partly Cloudy 28% 7 mph SW 65%
3 PM 36° Partly Cloudy 28% 7 mph SW 62%
4 PM 36° Mostly Clear 31% 6 mph WSW 60%
5 PM 36° Mostly Clear 20% 5 mph SW 62%
6 PM 36° Mostly Clear 35% 4 mph SW 65%
7 PM 34° Mostly Clear 29% 4 mph SW 69%
8 PM 33° Partly Cloudy 33% 6 mph WSW 74%
9 PM 30° Partly Cloudy 37% 7 mph W 78%
10 PM 29° Mostly Cloudy 46% 8 mph WNW 81%
11 PM 28° Mostly Cloudy 47% 3 mph WNW 84%
12 AM 27° Partly Cloudy 27% 4 mph E 86%
1 AM 26° Partly Cloudy 20% 5 mph ESE 88%
2 AM 26° Partly Cloudy 20% 5 mph SE 90%
3 AM 24° Partly Cloudy 20% 5 mph SSE 92%
4 AM 24° Partly Cloudy 9% 6 mph SSE 92%
5 AM 24° Partly Cloudy 9% 6 mph S 91%
6 AM 24° Mostly Clear 3% 6 mph S 90%
7 AM 24° Mostly Clear 3% 6 mph SSW 88%
8 AM 26° Mostly Clear 3% 6 mph SSW 85%
9 AM 28° Clear 3% 6 mph SSW 81%
15-Day Forecast
Today
7/26
Partly Cloudy
46%
23°
36°
Mon
7/27
Clear
36%
24°
37°
Tue
7/28
Mostly Clear
42%
21°
34°
Wed
7/29
Clear
14%
18°
30°
Thu
7/30
Clear
29%
18°
31°
Fri
7/31
Drizzle
64%
19°
27°
Sat
8/1
Drizzle
52%
18°
30°
Sun
8/2
Drizzle
43%
19°
30°
Mon
8/3
Drizzle
44%
19°
32°
Tue
8/4
Drizzle
51%
21°
33°
Wed
8/5
Drizzle
60%
21°
33°
Thu
8/6
Drizzle
60%
20°
32°
Fri
8/7
Drizzle
60%
20°
31°
Sat
8/8
Drizzle
60%
20°
32°
Sun
8/9
Drizzle
60%
21°
33°
50
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
50 AQI 9.1 µg/m³
O3
Ground-level ozone
44 AQI 48 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 50 Good 44 50
Tue 52 Moderate 40 52
Wed 43 Good 41 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 Sun Jul 26, 14:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE4284 J/kg
MLCAPE3510 J/kg
MUCAPE4284 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.8
Kinematics
0–6 km Shear20 kt
0–1 km Shear10 kt
Eff. Shear27 kt
0–1 km SRH-26
0–3 km SRH-65
Eff. SRH-65
Storm Motion287° @ 19 kt
0–1 km EHI-0.7
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.9
Thermo & Levels
PWAT1.98 in
0–3 km LR5.8 °C/km
700–500 LR5.9 °C/km
Total Totals49.0
LCL950 hPa
LFC997 hPa
EL140 hPa
Freezing Lvl16,824 ft