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

Clinton County, Illinois, United States

Last updated: 8:56 AM CDT  ·  Refresh
26°C
Feels like 32°
Fog
▲ 36°  /  ▼ 22°
Wind
3 mph S
Humidity
92%
Dew Point
25°
Pressure
29.45 inHg
Visibility
0 mi
UV Index
4.2
Cloud Cover
80%
Sunrise
5:54 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Clinton County is currently fog at 26°C. Precipitation is likely — peak probability 63% around 5 PM. Atmospheric instability is elevated (CAPE up to 4223 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
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
29%
9 AM
28°
31%
10 AM
30°
24%
11 AM
32°
18%
12 PM
33°
17%
1 PM
35°
42%
2 PM
36°
46%
3 PM
36°
46%
4 PM
34°
55%
5 PM
33°
62%
6 PM
31°
58%
7 PM
30°
44%
8 PM
29°
46%
9 PM
27°
43%
10 PM
26°
34%
11 PM
26°
23%
12 AM
25°
20%
1 AM
24°
11%
2 AM
23°
11%
3 AM
24°
11%
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 62% chance of rain.
Mon
36° 22°
Partly Cloudy with a 36% chance of rain.
Tue
34° 20°
Partly Cloudy with a 25% chance of rain.
Wed
31° 18°
Mostly Clear with a 25% chance of rain.
Thu
31° 18°
Clear.
Fri
27° 19°
Rain, 71% chance.
Sat
30° 18°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 26° Fog 29% 3 mph S 92%
9 AM 28° Mostly Cloudy 31% 5 mph S 88%
10 AM 30° Mostly Cloudy 24% 4 mph SSW 82%
11 AM 32° Partly Cloudy 18% 4 mph SW 75%
12 PM 33° Mostly Clear 17% 5 mph SW 69%
1 PM 35° Mostly Clear 42% 6 mph SW 65%
2 PM 36° Mostly Cloudy 46% 6 mph WSW 62%
3 PM 36° Mostly Cloudy 46% 6 mph WSW 59%
4 PM 34° Mostly Cloudy 55% 6 mph WSW 63%
5 PM 33° Overcast 62% 6 mph SSW 69%
6 PM 31° Mostly Cloudy 58% 7 mph S 78%
7 PM 30° Mostly Cloudy 44% 5 mph S 78%
8 PM 29° Overcast 46% 9 mph WSW 77%
9 PM 27° Overcast 43% 7 mph S 75%
10 PM 26° Partly Cloudy 34% 6 mph SE 80%
11 PM 26° Partly Cloudy 23% 6 mph SE 85%
12 AM 25° Partly Cloudy 20% 7 mph SE 90%
1 AM 24° Partly Cloudy 11% 6 mph SE 91%
2 AM 23° Partly Cloudy 11% 5 mph SSE 92%
3 AM 24° Partly Cloudy 11% 5 mph SSE 93%
4 AM 24° Partly Cloudy 9% 5 mph SSE 92%
5 AM 23° Partly Cloudy 3% 6 mph SE 90%
6 AM 23° Partly Cloudy 3% 7 mph SE 89%
7 AM 24° Partly Cloudy 3% 6 mph SE 87%
15-Day Forecast
Today
7/26
Mostly Cloudy
62%
22°
36°
Mon
7/27
Partly Cloudy
36%
22°
36°
Tue
7/28
Partly Cloudy
25%
20°
34°
Wed
7/29
Mostly Clear
25%
18°
31°
Thu
7/30
Clear
16%
18°
31°
Fri
7/31
Rain
71%
19°
27°
Sat
8/1
Drizzle
52%
18°
30°
Sun
8/2
Drizzle
43%
19°
31°
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°
54
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
54 AQI 10.6 µg/m³
O3
Ground-level ozone
50 AQI 54 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 54 Moderate 50 54
Tue 52 Moderate 42 52
Wed 48 Good 41 48
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 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2509 J/kg
MLCAPE2320 J/kg
MUCAPE2581 J/kg
SBCIN-95 J/kg
MLCIN0 J/kg
Lifted Index-4.6
Kinematics
0–6 km Shear17 kt
0–1 km Shear16 kt
Eff. Shear24 kt
0–1 km SRH-24
0–3 km SRH-41
Eff. SRH-41
Storm Motion300° @ 22 kt
0–1 km EHI-0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index31.2
Thermo & Levels
PWAT1.86 in
0–3 km LR4.7 °C/km
700–500 LR5.8 °C/km
Total Totals46.6
LCL977 hPa
LFC737 hPa
EL166 hPa
Freezing Lvl16,831 ft