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: 6:43 AM CDT  ·  Refresh
22°C
Feels like 26°
Mostly Clear
▲ 34°  /  ▼ 21°
Wind
4 mph NE
Humidity
94%
Dew Point
21°
Pressure
29.59 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
25%
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 22°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1791 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
22°
26%
7 AM
22°
29%
8 AM
24°
29%
9 AM
25°
21%
10 AM
28°
24%
11 AM
30°
28%
12 PM
32°
22%
1 PM
33°
16%
2 PM
33°
28%
3 PM
34°
36%
4 PM
33°
44%
5 PM
33°
44%
6 PM
31°
44%
7 PM
29°
45%
8 PM
28°
45%
9 PM
24°
42%
10 PM
24°
29%
11 PM
23°
20%
12 AM
23°
15%
1 AM
23°
15%
2 AM
23°
16%
3 AM
23°
13%
4 AM
23°
14%
5 AM
22°
14%
7-Day Forecast
Today
34° 21°
Mostly Clear with a 44% chance of rain.
Sat
37° 21°
Partly Cloudy.
Sun
35° 20°
Mostly Cloudy with a 62% chance of rain.
Mon
27° 16°
Mostly Cloudy with a 69% chance of rain.
Tue
24° 14°
Drizzle, 55% chance.
Wed
26° 13°
Overcast.
Thu
25° 12°
Overcast.
TimeTempConditionsPrecipWindHumidity
Now 22° Mostly Clear 26% 4 mph NE 94%
7 AM 22° Mostly Clear 29% 6 mph ENE 90%
8 AM 24° Mostly Clear 29% 6 mph ENE 83%
9 AM 25° Mostly Clear 21% 6 mph ENE 77%
10 AM 28° Clear 24% 5 mph ENE 67%
11 AM 30° Clear 28% 4 mph ENE 60%
12 PM 32° Clear 22% 4 mph NE 54%
1 PM 33° Clear 16% 3 mph NE 51%
2 PM 33° Clear 28% 3 mph ESE 50%
3 PM 34° Mostly Clear 36% 4 mph SSW 49%
4 PM 33° Mostly Clear 44% 4 mph SSE 52%
5 PM 33° Mostly Clear 44% 6 mph SE 57%
6 PM 31° Partly Cloudy 44% 7 mph ESE 63%
7 PM 29° Partly Cloudy 45% 7 mph ESE 70%
8 PM 28° Partly Cloudy 45% 6 mph ESE 77%
9 PM 24° Partly Cloudy 42% 7 mph ESE 83%
10 PM 24° Partly Cloudy 29% 7 mph ESE 89%
11 PM 23° Partly Cloudy 20% 6 mph ESE 91%
12 AM 23° Partly Cloudy 15% 6 mph ESE 91%
1 AM 23° Partly Cloudy 15% 6 mph SE 92%
2 AM 23° Partly Cloudy 16% 6 mph SE 92%
3 AM 23° Partly Cloudy 13% 6 mph SE 92%
4 AM 23° Partly Cloudy 14% 6 mph SE 91%
5 AM 22° Partly Cloudy 14% 6 mph SSE 91%
15-Day Forecast
Today
9/18
Mostly Clear
44%
21°
34°
Sat
9/19
Partly Cloudy
15%
21°
37°
Sun
9/20
Mostly Cloudy
62%
20°
35°
Mon
9/21
Mostly Cloudy
69%
16°
27°
Tue
9/22
Drizzle
55%
14°
24°
Wed
9/23
Overcast
9%
13°
26°
Thu
9/24
Overcast
7%
12°
25°
Fri
9/25
Overcast
20%
13°
26°
Sat
9/26
Partly Cloudy
21%
13°
26°
Sun
9/27
Clear
34%
13°
25°
Mon
9/28
Clear
46%
14°
28°
Tue
9/29
Clear
60%
15°
29°
Wed
9/30
Clear
25%
15°
29°
Thu
10/1
Clear
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, 10:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE124 J/kg
MLCAPE185 J/kg
MUCAPE1094 J/kg
SBCIN-402 J/kg
MLCIN-315 J/kg
Lifted Index-1.0
Kinematics
0–6 km Shear17 kt
0–1 km Shear15 kt
Eff. Shear9 kt
0–1 km SRH38
0–3 km SRH15
Eff. SRH-0
Storm Motion338° @ 17 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index39.3
Thermo & Levels
PWAT1.81 in
0–3 km LR4.3 °C/km
700–500 LR5.8 °C/km
Total Totals50.6
LCL987 hPa
LFC662 hPa
EL344 hPa
Freezing Lvl14,875 ft