Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO 8:00 PM

Fayette County, Illinois, United States

Last updated: 7:43 AM CDT  ·  Refresh
23°C
Feels like 26°
Mostly Clear
▲ 33°  /  ▼ 22°
Wind
5 mph NE
Humidity
92%
Dew Point
22°
Pressure
29.59 inHg
Visibility
9 mi
UV Index
2.9
Cloud Cover
22%
Sunrise
6:40 AM
Sunset
6:59 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Fayette County is currently mostly clear at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2279 J/kg) — isolated convective development possible. Sunrise: 6:40AM · Sunset: 6:59PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO
Expires 8:00 PM
44 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
24%
8 AM
24°
29%
9 AM
26°
21%
10 AM
28°
21%
11 AM
29°
28%
12 PM
31°
31%
1 PM
33°
27%
2 PM
33°
28%
3 PM
33°
36%
4 PM
33°
44%
5 PM
33°
44%
6 PM
31°
44%
7 PM
29°
44%
8 PM
28°
45%
9 PM
24°
41%
10 PM
24°
28%
11 PM
23°
20%
12 AM
23°
15%
1 AM
23°
15%
2 AM
23°
15%
3 AM
23°
13%
4 AM
23°
13%
5 AM
22°
14%
6 AM
22°
11%
7-Day Forecast
Today
33° 22°
Mostly Clear with a 44% chance of rain.
Sat
37° 22°
Partly Cloudy.
Sun
35° 20°
Mostly Cloudy with a 62% chance of rain.
Mon
26° 16°
Mostly Cloudy with a 69% chance of rain.
Tue
24° 14°
Drizzle, 55% chance.
Wed
26° 13°
Overcast.
Thu
25° 12°
Mostly Cloudy.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 24% 5 mph NE 92%
8 AM 24° Clear 29% 6 mph ENE 84%
9 AM 26° Mostly Clear 21% 6 mph E 78%
10 AM 28° Clear 21% 4 mph E 70%
11 AM 29° Clear 28% 3 mph E 63%
12 PM 31° Clear 31% 3 mph ENE 57%
1 PM 33° Clear 27% 2 mph ENE 54%
2 PM 33° Clear 28% 3 mph ESE 54%
3 PM 33° Mostly Clear 36% 4 mph S 54%
4 PM 33° Mostly Clear 44% 5 mph SE 57%
5 PM 33° Mostly Clear 44% 7 mph ESE 62%
6 PM 31° Partly Cloudy 44% 8 mph ESE 69%
7 PM 29° Partly Cloudy 44% 7 mph ESE 76%
8 PM 28° Partly Cloudy 45% 6 mph ESE 82%
9 PM 24° Partly Cloudy 41% 7 mph SE 88%
10 PM 24° Partly Cloudy 28% 8 mph ESE 92%
11 PM 23° Partly Cloudy 20% 7 mph ESE 93%
12 AM 23° Partly Cloudy 15% 7 mph SE 94%
1 AM 23° Partly Cloudy 15% 6 mph SE 94%
2 AM 23° Partly Cloudy 15% 7 mph SE 94%
3 AM 23° Partly Cloudy 13% 7 mph SE 94%
4 AM 23° Partly Cloudy 13% 7 mph SE 94%
5 AM 22° Partly Cloudy 14% 7 mph SSE 93%
6 AM 22° Haze 11% 7 mph SSE 93%
15-Day Forecast
Today
9/18
Mostly Clear
44%
22°
33°
Sat
9/19
Partly Cloudy
15%
22°
37°
Sun
9/20
Mostly Cloudy
62%
20°
35°
Mon
9/21
Mostly Cloudy
69%
16°
26°
Tue
9/22
Drizzle
55%
14°
24°
Wed
9/23
Overcast
9%
13°
26°
Thu
9/24
Mostly Cloudy
7%
12°
25°
Fri
9/25
Overcast
20%
13°
26°
Sat
9/26
Mostly Cloudy
21%
13°
26°
Sun
9/27
Clear
34%
13°
25°
Mon
9/28
Drizzle
60%
14°
28°
Tue
9/29
Clear
60%
15°
29°
Wed
9/30
Clear
25%
15°
29°
Thu
10/1
Drizzle
60%
15°
29°
Fri
10/2
Drizzle
60%
13°
27°
44
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
42 AQI 7.6 µg/m³
O3
Ground-level ozone
Dominant
44 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 44 Good 44 42
Sun 45 Good 45 44
Mon 46 Good 43 46
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 Fri Sep 18, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE365 J/kg
MLCAPE395 J/kg
MUCAPE1000 J/kg
SBCIN-338 J/kg
MLCIN-290 J/kg
Lifted Index-1.9
Kinematics
0–6 km Shear17 kt
0–1 km Shear16 kt
Eff. Shear11 kt
0–1 km SRH50
0–3 km SRH35
Eff. SRH22
Storm Motion337° @ 18 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index40.4
Thermo & Levels
PWAT1.83 in
0–3 km LR4.7 °C/km
700–500 LR5.7 °C/km
Total Totals50.3
LCL980 hPa
LFC716 hPa
EL261 hPa
Freezing Lvl14,921 ft