Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Marion, 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, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 8:00 PM

Marion County, Illinois, United States

Last updated: 5:11 AM CDT  ·  Refresh
25°C
Feels like 27°
Mostly Clear
▲ 34°  /  ▼ 24°
Wind
6 mph SSW
Humidity
84%
Dew Point
22°
Pressure
29.41 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
23%
Sunrise
6:06 AM
Sunset
7:54 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Marion County is currently mostly clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3574 J/kg) — isolated convective development possible. Sunrise: 6:06AM · Sunset: 7:54PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Marion, 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, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 8:00 PM
46 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
8%
6 AM
24°
25%
7 AM
24°
23%
8 AM
26°
25%
9 AM
27°
25%
10 AM
28°
27%
11 AM
29°
30%
12 PM
31°
33%
1 PM
33°
24%
2 PM
33°
33%
3 PM
33°
23%
4 PM
34°
23%
5 PM
34°
21%
6 PM
33°
25%
7 PM
32°
23%
8 PM
31°
21%
9 PM
29°
22%
10 PM
28°
22%
11 PM
28°
22%
12 AM
27°
23%
1 AM
27°
8%
2 AM
27°
9%
3 AM
26°
9%
4 AM
25°
9%
7-Day Forecast
Today
34° 24°
Mostly Clear with a 33% chance of rain.
Wed
34° 24°
Heavy Rain, 79% chance.
Thu
33° 23°
Partly Cloudy with a 51% chance of rain.
Fri
32° 22°
Clear with a 60% chance of rain.
Sat
34° 22°
Mostly Clear.
Sun
34° 22°
Mostly Clear with a 25% chance of rain.
Mon
30° 21°
Partly Cloudy with a 28% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Mostly Clear 8% 6 mph SSW 84%
6 AM 24° Mostly Clear 25% 8 mph SSW 83%
7 AM 24° Partly Cloudy 23% 9 mph SSW 83%
8 AM 26° Partly Cloudy 25% 10 mph SW 79%
9 AM 27° Partly Cloudy 25% 11 mph SW 75%
10 AM 28° Partly Cloudy 27% 11 mph SW 72%
11 AM 29° Partly Cloudy 30% 11 mph SW 68%
12 PM 31° Partly Cloudy 33% 12 mph SW 64%
1 PM 33° Clear 24% 12 mph WSW 61%
2 PM 33° Clear 33% 12 mph SW 59%
3 PM 33° Mostly Clear 23% 12 mph SW 57%
4 PM 34° Mostly Clear 23% 12 mph SW 56%
5 PM 34° Mostly Clear 21% 10 mph SW 60%
6 PM 33° Mostly Clear 25% 9 mph SW 64%
7 PM 32° Mostly Clear 23% 7 mph SSW 68%
8 PM 31° Mostly Clear 21% 7 mph SSW 69%
9 PM 29° Mostly Clear 22% 8 mph SSW 69%
10 PM 28° Mostly Clear 22% 8 mph SSW 70%
11 PM 28° Mostly Clear 22% 7 mph SSW 73%
12 AM 27° Mostly Clear 23% 7 mph SSW 76%
1 AM 27° Mostly Clear 8% 7 mph SW 79%
2 AM 27° Mostly Clear 9% 7 mph SSW 80%
3 AM 26° Mostly Clear 9% 7 mph SSW 81%
4 AM 25° Mostly Clear 9% 7 mph SW 82%
15-Day Forecast
Today
8/11
Mostly Clear
33%
24°
34°
Wed
8/12
Heavy Rain
79%
24°
34°
Thu
8/13
Partly Cloudy
51%
23°
33°
Fri
8/14
Clear
60%
22°
32°
Sat
8/15
Mostly Clear
15%
22°
34°
Sun
8/16
Mostly Clear
25%
22°
34°
Mon
8/17
Partly Cloudy
28%
21°
30°
Tue
8/18
Clear
34%
20°
32°
Wed
8/19
Mostly Clear
35%
22°
34°
Thu
8/20
Clear
35%
22°
34°
Fri
8/21
Drizzle
60%
19°
34°
Sat
8/22
Drizzle
60%
20°
32°
Sun
8/23
Clear
60%
20°
32°
Mon
8/24
Drizzle
60%
19°
31°
Tue
8/25
Drizzle
60%
19°
31°
46
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
46 AQI 8.3 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 46 Good 35 46
Wed 35 Good 35 24
Thu 34 Good 34 24
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 Tue Aug 11, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1799 J/kg
MLCAPE1701 J/kg
MUCAPE2452 J/kg
SBCIN-451 J/kg
MLCIN0 J/kg
Lifted Index-6.1
Kinematics
0–6 km Shear17 kt
0–1 km Shear19 kt
Eff. Shear9 kt
0–1 km SRH118
0–3 km SRH102
Eff. SRH-8
Storm Motion320° @ 17 kt
0–1 km EHI1.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.5
Thermo & Levels
PWAT1.57 in
0–3 km LR4.0 °C/km
700–500 LR7.9 °C/km
Total Totals50.8
LCL961 hPa
LFC667 hPa
EL175 hPa
Freezing Lvl14,521 ft