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

Marion County, Illinois, United States

Last updated: 8:57 AM CDT  ·  Refresh
25°C
Feels like 29°
Fog
▲ 34°  /  ▼ 22°
Wind
4 mph SSE
Humidity
94%
Dew Point
24°
Pressure
29.37 inHg
Visibility
0 mi
UV Index
4.1
Cloud Cover
82%
Sunrise
5:52 AM
Sunset
8:11 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Marion County is currently fog at 25°C. Precipitation is likely — peak probability 58% around 3 PM. Atmospheric instability is elevated (CAPE up to 4326 J/kg) — isolated convective development possible. Sunrise: 5:52AM · Sunset: 8:11PM.

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
53 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
16%
9 AM
26°
27%
10 AM
28°
32%
11 AM
30°
51%
12 PM
32°
52%
1 PM
33°
47%
2 PM
33°
49%
3 PM
34°
57%
4 PM
33°
54%
5 PM
32°
54%
6 PM
31°
36%
7 PM
30°
22%
8 PM
27°
37%
9 PM
26°
45%
10 PM
25°
33%
11 PM
24°
23%
12 AM
23°
23%
1 AM
23°
24%
2 AM
23°
24%
3 AM
23°
25%
4 AM
23°
11%
5 AM
23°
11%
6 AM
23°
3%
7 AM
24°
3%
7-Day Forecast
Today
34° 22°
Mostly Cloudy with a 54% chance of rain.
Mon
35° 22°
Partly Cloudy with a 36% chance of rain.
Tue
34° 19°
Mostly Clear with a 42% chance of rain.
Wed
30° 17°
Clear with a 37% chance of rain.
Thu
31° 17°
Clear.
Fri
27° 19°
Drizzle, 59% chance.
Sat
30° 18°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 25° Fog 16% 4 mph SSE 94%
9 AM 26° Overcast 27% 6 mph SSE 94%
10 AM 28° Mostly Cloudy 32% 4 mph S 88%
11 AM 30° Mostly Cloudy 51% 3 mph S 82%
12 PM 32° Partly Cloudy 52% 4 mph SSW 76%
1 PM 33° Partly Cloudy 47% 5 mph SSW 72%
2 PM 33° Partly Cloudy 49% 6 mph SW 71%
3 PM 34° Mostly Cloudy 57% 8 mph WSW 70%
4 PM 33° Partly Cloudy 54% 7 mph WSW 71%
5 PM 32° Mostly Cloudy 54% 7 mph W 74%
6 PM 31° Mostly Cloudy 36% 8 mph SW 77%
7 PM 30° Mostly Cloudy 22% 7 mph SW 79%
8 PM 27° Partly Cloudy 37% 7 mph SW 81%
9 PM 26° Mostly Cloudy 45% 9 mph SW 82%
10 PM 25° Partly Cloudy 33% 6 mph SW 85%
11 PM 24° Partly Cloudy 23% 6 mph SSE 88%
12 AM 23° Partly Cloudy 23% 9 mph ESE 90%
1 AM 23° Partly Cloudy 24% 8 mph ESE 91%
2 AM 23° Mostly Cloudy 24% 6 mph SE 91%
3 AM 23° Mostly Cloudy 25% 5 mph SE 92%
4 AM 23° Mostly Cloudy 11% 6 mph SE 91%
5 AM 23° Mostly Cloudy 11% 6 mph SE 90%
6 AM 23° Mostly Cloudy 3% 7 mph SE 90%
7 AM 24° Mostly Cloudy 3% 6 mph SSE 87%
15-Day Forecast
Today
7/26
Mostly Cloudy
54%
22°
34°
Mon
7/27
Partly Cloudy
36%
22°
35°
Tue
7/28
Mostly Clear
42%
19°
34°
Wed
7/29
Clear
37%
17°
30°
Thu
7/30
Clear
16%
17°
31°
Fri
7/31
Drizzle
59%
19°
27°
Sat
8/1
Drizzle
52%
18°
30°
Sun
8/2
Drizzle
43%
18°
31°
Mon
8/3
Drizzle
44%
19°
32°
Tue
8/4
Drizzle
51%
21°
34°
Wed
8/5
Drizzle
60%
21°
33°
Thu
8/6
Drizzle
60%
20°
32°
Fri
8/7
Drizzle
60%
19°
31°
Sat
8/8
Drizzle
60%
19°
32°
Sun
8/9
Drizzle
60%
20°
33°
53
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
53 AQI 10.4 µg/m³
O3
Ground-level ozone
44 AQI 48 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 53 Moderate 44 53
Tue 49 Good 38 49
Wed 50 Good 41 50
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
SBCAPE1847 J/kg
MLCAPE2159 J/kg
MUCAPE2654 J/kg
SBCIN-138 J/kg
MLCIN0 J/kg
Lifted Index-3.1
Kinematics
0–6 km Shear23 kt
0–1 km Shear17 kt
Eff. Shear27 kt
0–1 km SRH-30
0–3 km SRH-47
Eff. SRH-47
Storm Motion302° @ 23 kt
0–1 km EHI-0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index29.9
Thermo & Levels
PWAT1.82 in
0–3 km LR4.4 °C/km
700–500 LR5.8 °C/km
Total Totals46.7
LCL982 hPa
LFC710 hPa
EL177 hPa
Freezing Lvl16,706 ft