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: 1:15 PM CDT  ·  Refresh
32°C
Feels like 39°
Mostly Cloudy
▲ 34°  /  ▼ 23°
Wind
11 mph WSW
Humidity
62%
Dew Point
25°
Pressure
29.29 inHg
Visibility
10 mi
UV Index
6.9
Cloud Cover
70%
Sunrise
6:07 AM
Sunset
7:53 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Marion County is currently mostly cloudy at 32°C. Precipitation is likely — peak probability 69% around 9 PM. Atmospheric instability is elevated (CAPE up to 4019 J/kg) — isolated convective development possible. Sunrise: 6:07AM · Sunset: 7:53PM.

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
39 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
46%
2 PM
31°
58%
3 PM
31°
57%
4 PM
32°
36%
5 PM
33°
30%
6 PM
32°
35%
7 PM
31°
51%
8 PM
29°
57%
9 PM
27°
68%
10 PM
26°
57%
11 PM
25°
58%
12 AM
25°
58%
1 AM
24°
53%
2 AM
24°
62%
3 AM
24°
62%
4 AM
24°
53%
5 AM
23°
46%
6 AM
23°
42%
7 AM
23°
28%
8 AM
24°
28%
9 AM
26°
23%
10 AM
27°
20%
11 AM
28°
20%
12 PM
29°
15%
7-Day Forecast
Today
34° 23°
Mostly Cloudy with a 57% chance of rain.
Thu
37° 23°
Partly Cloudy with a 53% chance of rain.
Fri
38° 24°
Mostly Clear.
Sat
37° 24°
Clear with a 57% chance of rain.
Sun
36° 23°
Clear with a 35% chance of rain.
Mon
32° 21°
Rain, 81% chance.
Tue
34° 17°
Rain, 90% chance.
TimeTempConditionsPrecipWindHumidity
Now 32° Mostly Cloudy 46% 11 mph WSW 62%
2 PM 31° Heavy Rain 58% 14 mph W 66%
3 PM 31° Mostly Cloudy 57% 4 mph WSW 69%
4 PM 32° Overcast 36% 5 mph SSW 68%
5 PM 33° Overcast 30% 6 mph S 69%
6 PM 32° Mostly Cloudy 35% 7 mph SSE 71%
7 PM 31° Mostly Cloudy 51% 5 mph S 74%
8 PM 29° Mostly Cloudy 57% 5 mph SE 79%
9 PM 27° Mostly Cloudy 68% 6 mph E 84%
10 PM 26° Mostly Cloudy 57% 6 mph NE 88%
11 PM 25° Partly Cloudy 58% 5 mph ENE 90%
12 AM 25° Mostly Cloudy 58% 3 mph E 92%
1 AM 24° Partly Cloudy 53% 5 mph SE 93%
2 AM 24° Partly Cloudy 62% 4 mph SE 94%
3 AM 24° Mostly Cloudy 62% 5 mph ESE 95%
4 AM 24° Mostly Cloudy 53% 6 mph ESE 96%
5 AM 23° Mostly Cloudy 46% 5 mph ESE 96%
6 AM 23° Mostly Cloudy 42% 5 mph E 95%
7 AM 23° Mostly Cloudy 28% 5 mph ENE 94%
8 AM 24° Mostly Cloudy 28% 4 mph E 90%
9 AM 26° Mostly Cloudy 23% 4 mph E 87%
10 AM 27° Mostly Cloudy 20% 4 mph ESE 83%
11 AM 28° Mostly Cloudy 20% 5 mph SE 78%
12 PM 29° Mostly Cloudy 15% 6 mph SE 73%
15-Day Forecast
Today
8/12
Mostly Cloudy
57%
23°
34°
Thu
8/13
Partly Cloudy
53%
23°
37°
Fri
8/14
Mostly Clear
18%
24°
38°
Sat
8/15
Clear
57%
24°
37°
Sun
8/16
Clear
35%
23°
36°
Mon
8/17
Rain
81%
21°
32°
Tue
8/18
Rain
90%
17°
34°
Wed
8/19
Thunderstorm
60%
19°
36°
Thu
8/20
Drizzle
60%
22°
36°
Fri
8/21
Clear
60%
19°
34°
Sat
8/22
Clear
25%
14°
33°
Sun
8/23
Drizzle
60%
21°
33°
Mon
8/24
Drizzle
60%
20°
33°
Tue
8/25
Drizzle
60%
19°
32°
Wed
8/26
Drizzle
60%
19°
32°
39
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
29 AQI 5.2 µg/m³
O3
Ground-level ozone
Dominant
39 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 39 Good 39 29
Fri 39 Good 39 36
Sat 44 Good 41 44
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 Wed Aug 12, 17:00'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
SBCAPE4887 J/kg
MLCAPE3670 J/kg
MUCAPE4887 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-9.9
Kinematics
0–6 km Shear16 kt
0–1 km Shear3 kt
Eff. Shear26 kt
0–1 km SRH7
0–3 km SRH28
Eff. SRH28
Storm Motion297° @ 23 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.3
Supercell1.8
K-Index29.7
Thermo & Levels
PWAT2.05 in
0–3 km LR7.2 °C/km
700–500 LR6.6 °C/km
Total Totals51.5
LCL889 hPa
LFC992 hPa
EL132 hPa
Freezing Lvl14,738 ft