Extreme 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: 10:11 AM CDT  ·  Refresh
29°C
Feels like 35°
Partly Cloudy
▲ 37°  /  ▼ 23°
Wind
4 mph SSW
Humidity
82%
Dew Point
26°
Pressure
29.44 inHg
Visibility
9 mi
UV Index
7.6
Cloud Cover
48%
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 29°C. Precipitation is likely — peak probability 50% around 9 PM. Atmospheric instability is elevated (CAPE up to 4231 J/kg) — isolated convective development possible. Sunrise: 5:54AM · Sunset: 8:13PM.

Alerts

Extreme 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°
4%
11 AM
31°
26%
12 PM
32°
29%
1 PM
34°
28%
2 PM
34°
23%
3 PM
36°
28%
4 PM
36°
31%
5 PM
37°
23%
6 PM
36°
35%
7 PM
34°
33%
8 PM
33°
38%
9 PM
29°
50%
10 PM
28°
46%
11 PM
28°
35%
12 AM
27°
31%
1 AM
26°
20%
2 AM
25°
20%
3 AM
24°
20%
4 AM
24°
9%
5 AM
23°
9%
6 AM
23°
3%
7 AM
24°
3%
8 AM
25°
3%
9 AM
28°
3%
7-Day Forecast
Today
37° 23°
Mostly Clear with a 46% chance of rain.
Mon
37° 23°
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 4% 4 mph SSW 82%
11 AM 31° Mostly Cloudy 26% 5 mph SW 78%
12 PM 32° Partly Cloudy 29% 6 mph SW 74%
1 PM 34° Mostly Clear 28% 7 mph SW 70%
2 PM 34° Partly Cloudy 23% 7 mph SW 66%
3 PM 36° Partly Cloudy 28% 7 mph SW 62%
4 PM 36° Mostly Clear 31% 6 mph WSW 60%
5 PM 37° Mostly Clear 23% 5 mph SW 62%
6 PM 36° Mostly Clear 35% 5 mph SW 64%
7 PM 34° Partly Cloudy 33% 5 mph SSW 69%
8 PM 33° Mostly Cloudy 38% 6 mph SW 73%
9 PM 29° Rain 50% 6 mph WSW 77%
10 PM 28° Mostly Cloudy 46% 7 mph W 80%
11 PM 28° Mostly Cloudy 35% 4 mph NNW 84%
12 AM 27° Partly Cloudy 31% 3 mph ESE 86%
1 AM 26° Partly Cloudy 20% 5 mph ESE 88%
2 AM 25° Partly Cloudy 20% 4 mph SE 90%
3 AM 24° Partly Cloudy 20% 5 mph SSE 91%
4 AM 24° Partly Cloudy 9% 6 mph SSE 92%
5 AM 23° Partly Cloudy 9% 6 mph S 91%
6 AM 23° Mostly Clear 3% 6 mph S 90%
7 AM 24° Mostly Clear 3% 6 mph SSW 89%
8 AM 25° Mostly Clear 3% 6 mph SSW 85%
9 AM 28° Clear 3% 7 mph S 81%
15-Day Forecast
Today
7/26
Mostly Clear
46%
23°
37°
Mon
7/27
Clear
36%
23°
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%
21°
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, 13:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3959 J/kg
MLCAPE3152 J/kg
MUCAPE3959 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-6.9
Kinematics
0–6 km Shear20 kt
0–1 km Shear13 kt
Eff. Shear31 kt
0–1 km SRH-33
0–3 km SRH-57
Eff. SRH-57
Storm Motion293° @ 21 kt
0–1 km EHI-0.8
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.7
Thermo & Levels
PWAT1.93 in
0–3 km LR5.7 °C/km
700–500 LR5.7 °C/km
Total Totals47.9
LCL953 hPa
LFC997 hPa
EL143 hPa
Freezing Lvl16,778 ft