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: 8:56 AM CDT  ·  Refresh
27°C
Feels like 30°
Mostly Cloudy
▲ 36°  /  ▼ 22°
Wind
3 mph SSW
Humidity
91%
Dew Point
25°
Pressure
29.45 inHg
Visibility
7 mi
UV Index
4.1
Cloud Cover
81%
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 mostly cloudy at 27°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4018 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
27°
32%
9 AM
28°
48%
10 AM
30°
33%
11 AM
32°
16%
12 PM
33°
14%
1 PM
34°
31%
2 PM
36°
35%
3 PM
36°
41%
4 PM
34°
42%
5 PM
33°
37%
6 PM
31°
41%
7 PM
30°
37%
8 PM
29°
25%
9 PM
27°
26%
10 PM
26°
35%
11 PM
26°
23%
12 AM
26°
20%
1 AM
25°
20%
2 AM
24°
21%
3 AM
24°
21%
4 AM
24°
9%
5 AM
23°
3%
6 AM
23°
3%
7 AM
24°
3%
7-Day Forecast
Today
36° 22°
Mostly Cloudy with a 37% chance of rain.
Mon
36° 22°
Partly Cloudy with a 36% chance of rain.
Tue
35° 21°
Partly Cloudy with a 42% chance of rain.
Wed
30° 18°
Mostly Clear with a 25% chance of rain.
Thu
31° 18°
Clear.
Fri
27° 19°
Rain, 64% chance.
Sat
30° 18°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 27° Mostly Cloudy 32% 3 mph SSW 91%
9 AM 28° Partly Cloudy 48% 4 mph SW 86%
10 AM 30° Partly Cloudy 33% 5 mph SW 79%
11 AM 32° Mostly Cloudy 16% 5 mph WSW 72%
12 PM 33° Mostly Clear 14% 5 mph WSW 67%
1 PM 34° Mostly Clear 31% 5 mph SW 63%
2 PM 36° Partly Cloudy 35% 6 mph SW 60%
3 PM 36° Mostly Clear 41% 7 mph SW 58%
4 PM 34° Mostly Cloudy 42% 7 mph SW 62%
5 PM 33° Partly Cloudy 37% 7 mph SSW 67%
6 PM 31° Mostly Cloudy 41% 9 mph S 74%
7 PM 30° Mostly Cloudy 37% 7 mph S 77%
8 PM 29° Overcast 25% 7 mph WSW 77%
9 PM 27° Overcast 26% 7 mph W 78%
10 PM 26° Mostly Cloudy 35% 6 mph SSE 81%
11 PM 26° Partly Cloudy 23% 6 mph S 84%
12 AM 26° Partly Cloudy 20% 7 mph S 87%
1 AM 25° Partly Cloudy 20% 6 mph S 88%
2 AM 24° Partly Cloudy 21% 5 mph S 90%
3 AM 24° Partly Cloudy 21% 6 mph S 91%
4 AM 24° Partly Cloudy 9% 6 mph S 90%
5 AM 23° Partly Cloudy 3% 6 mph SSE 89%
6 AM 23° Partly Cloudy 3% 7 mph SE 88%
7 AM 24° Partly Cloudy 3% 6 mph SSE 86%
15-Day Forecast
Today
7/26
Mostly Cloudy
37%
22°
36°
Mon
7/27
Partly Cloudy
36%
22°
36°
Tue
7/28
Partly Cloudy
42%
21°
35°
Wed
7/29
Mostly Clear
25%
18°
30°
Thu
7/30
Clear
16%
18°
31°
Fri
7/31
Rain
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%
19°
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, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2711 J/kg
MLCAPE2297 J/kg
MUCAPE2711 J/kg
SBCIN-67 J/kg
MLCIN0 J/kg
Lifted Index-5.0
Kinematics
0–6 km Shear15 kt
0–1 km Shear14 kt
Eff. Shear24 kt
0–1 km SRH-18
0–3 km SRH-35
Eff. SRH-35
Storm Motion303° @ 22 kt
0–1 km EHI-0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index31.4
Thermo & Levels
PWAT1.85 in
0–3 km LR4.8 °C/km
700–500 LR5.8 °C/km
Total Totals46.7
LCL974 hPa
LFC862 hPa
EL161 hPa
Freezing Lvl16,831 ft