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: 10:19 AM CDT  ·  Refresh
27°C
Feels like 31°
Mostly Cloudy
▲ 35°  /  ▼ 22°
Wind
5 mph SSE
Humidity
89%
Dew Point
25°
Pressure
29.37 inHg
Visibility
3 mi
UV Index
5.1
Cloud Cover
80%
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 mostly cloudy at 27°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4493 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
27°
25%
11 AM
29°
38%
12 PM
31°
43%
1 PM
33°
43%
2 PM
33°
39%
3 PM
34°
43%
4 PM
34°
39%
5 PM
35°
28%
6 PM
34°
30%
7 PM
34°
28%
8 PM
32°
33%
9 PM
29°
46%
10 PM
28°
48%
11 PM
27°
49%
12 AM
26°
32%
1 AM
24°
37%
2 AM
24°
27%
3 AM
23°
28%
4 AM
23°
15%
5 AM
23°
15%
6 AM
23°
11%
7 AM
23°
3%
8 AM
25°
3%
9 AM
28°
3%
7-Day Forecast
Today
35° 22°
Partly Cloudy with a 48% chance of rain.
Mon
36° 23°
Mostly Clear with a 49% chance of rain.
Tue
33° 20°
Mostly Clear with a 42% chance of rain.
Wed
30° 18°
Clear with a 36% chance of rain.
Thu
31° 17°
Clear.
Fri
27° 19°
Drizzle, 52% chance.
Sat
30° 18°
Clear with a 52% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 27° Mostly Cloudy 25% 5 mph SSE 89%
11 AM 29° Mostly Cloudy 38% 5 mph S 84%
12 PM 31° Mostly Cloudy 43% 6 mph SW 80%
1 PM 33° Partly Cloudy 43% 8 mph SW 76%
2 PM 33° Partly Cloudy 39% 8 mph SW 73%
3 PM 34° Mostly Clear 43% 8 mph WSW 70%
4 PM 34° Mostly Clear 39% 7 mph WSW 69%
5 PM 35° Mostly Clear 28% 6 mph WSW 70%
6 PM 34° Mostly Clear 30% 5 mph WSW 72%
7 PM 34° Mostly Clear 28% 4 mph WSW 75%
8 PM 32° Partly Cloudy 33% 5 mph W 80%
9 PM 29° Partly Cloudy 46% 8 mph W 84%
10 PM 28° Mostly Cloudy 48% 10 mph WNW 87%
11 PM 27° Mostly Cloudy 49% 6 mph WNW 88%
12 AM 26° Mostly Cloudy 32% 5 mph ESE 90%
1 AM 24° Mostly Cloudy 37% 8 mph ESE 92%
2 AM 24° Mostly Cloudy 27% 8 mph SE 92%
3 AM 23° Mostly Cloudy 28% 7 mph SSE 93%
4 AM 23° Mostly Cloudy 15% 6 mph S 93%
5 AM 23° Mostly Cloudy 15% 6 mph S 91%
6 AM 23° Mostly Cloudy 11% 5 mph SSW 90%
7 AM 23° Mostly Cloudy 3% 5 mph SSW 88%
8 AM 25° Partly Cloudy 3% 5 mph SSW 84%
9 AM 28° Partly Cloudy 3% 6 mph SSW 81%
15-Day Forecast
Today
7/26
Partly Cloudy
48%
22°
35°
Mon
7/27
Mostly Clear
49%
23°
36°
Tue
7/28
Mostly Clear
42%
20°
33°
Wed
7/29
Clear
36%
18°
30°
Thu
7/30
Clear
16%
17°
31°
Fri
7/31
Drizzle
52%
19°
27°
Sat
8/1
Clear
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%
21°
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, 14:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2738 J/kg
MLCAPE2901 J/kg
MUCAPE3318 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-5.6
Kinematics
0–6 km Shear22 kt
0–1 km Shear13 kt
Eff. Shear26 kt
0–1 km SRH-25
0–3 km SRH-66
Eff. SRH-66
Storm Motion294° @ 22 kt
0–1 km EHI-0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.4
Thermo & Levels
PWAT1.91 in
0–3 km LR4.8 °C/km
700–500 LR6.1 °C/km
Total Totals48.5
LCL969 hPa
LFC994 hPa
EL163 hPa
Freezing Lvl16,585 ft