Excessive Heat Warning — Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO 8:00 PM

Mount Vernon, Illinois

Last updated: 12:59 PM CDT  ·  Refresh
32°C
Feels like 38°
Partly Cloudy
▲ 35°  /  ▼ 24°
Wind
6 mph SSE
Humidity
61%
Dew Point
24°
Pressure
29.52 inHg
Visibility
10 mi
UV Index
8.9
Cloud Cover
41%
Sunrise
6:09 AM
Sunset
7:50 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mount Vernon is currently partly cloudy at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2850 J/kg) — isolated convective development possible. Sunrise: 6:09AM · Sunset: 7:50PM.

Alerts

Excessive Heat Warning
Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO
Expires 8:00 PM
42 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
26%
1 PM
33°
3%
2 PM
34°
4%
3 PM
33°
5%
4 PM
35°
7%
5 PM
34°
5%
6 PM
33°
5%
7 PM
32°
5%
8 PM
30°
5%
9 PM
29°
5%
10 PM
28°
5%
11 PM
27°
9%
12 AM
26°
9%
1 AM
26°
9%
2 AM
26°
5%
3 AM
25°
5%
4 AM
25°
5%
5 AM
25°
5%
6 AM
24°
5%
7 AM
26°
5%
8 AM
27°
12%
9 AM
27°
10%
10 AM
28°
10%
11 AM
29°
10%
7-Day Forecast
Today
35° 24°
Mostly Clear with a 26% chance of rain.
Sat
37° 24°
Mostly Clear.
Sun
33° 24°
Partly Cloudy with a 71% chance of rain.
Mon
30° 22°
Mostly Cloudy with a 55% chance of rain.
Tue
32° 21°
Clear.
Wed
34° 20°
Thunderstorm, 68% chance.
Thu
29° 18°
Clear with a 25% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 32° Partly Cloudy 26% 6 mph SSE 61%
1 PM 33° Mostly Clear 3% 5 mph SSW 59%
2 PM 34° Clear 4% 7 mph SSW 56%
3 PM 33° Clear 5% 8 mph SSW 55%
4 PM 35° Clear 7% 8 mph SSW 57%
5 PM 34° Clear 5% 6 mph SSW 60%
6 PM 33° Clear 5% 5 mph SSW 65%
7 PM 32° Clear 5% 4 mph S 69%
8 PM 30° Clear 5% 4 mph SSE 72%
9 PM 29° Clear 5% 4 mph SE 75%
10 PM 28° Clear 5% 5 mph SE 77%
11 PM 27° Clear 9% 6 mph SE 79%
12 AM 26° Clear 9% 6 mph SE 80%
1 AM 26° Clear 9% 6 mph SE 81%
2 AM 26° Clear 5% 6 mph SSE 82%
3 AM 25° Mostly Clear 5% 6 mph S 82%
4 AM 25° Mostly Clear 5% 6 mph S 83%
5 AM 25° Mostly Clear 5% 6 mph S 83%
6 AM 24° Mostly Clear 5% 6 mph S 84%
7 AM 26° Partly Cloudy 5% 5 mph SSW 80%
8 AM 27° Partly Cloudy 12% 5 mph SSW 77%
9 AM 27° Partly Cloudy 10% 6 mph SW 73%
10 AM 28° Partly Cloudy 10% 6 mph SSW 69%
11 AM 29° Partly Cloudy 10% 6 mph SSW 64%
15-Day Forecast
Today
8/14
Mostly Clear
26%
24°
35°
Sat
8/15
Mostly Clear
17%
24°
37°
Sun
8/16
Partly Cloudy
71%
24°
33°
Mon
8/17
Mostly Cloudy
55%
22°
30°
Tue
8/18
Clear
19%
21°
32°
Wed
8/19
Thunderstorm
68%
20°
34°
Thu
8/20
Clear
25%
18°
29°
Fri
8/21
Drizzle
60%
16°
30°
Sat
8/22
Drizzle
60%
13°
30°
Sun
8/23
Drizzle
60%
15°
32°
Mon
8/24
Clear
25%
17°
32°
Tue
8/25
Drizzle
60%
19°
32°
Wed
8/26
Clear
60%
19°
33°
Thu
8/27
Drizzle
60%
19°
32°
Fri
8/28
Drizzle
60%
19°
32°
42
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
42 AQI 7.6 µg/m³
O3
Ground-level ozone
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 42 Good 34 42
Sun 53 Moderate 38 53
Mon 54 Moderate 39 54
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 Aug 14, 16:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3394 J/kg
MLCAPE1682 J/kg
MUCAPE3394 J/kg
SBCIN-20 J/kg
MLCIN-85 J/kg
Lifted Index-7.3
Kinematics
0–6 km Shear28 kt
0–1 km Shear11 kt
Eff. Shear19 kt
0–1 km SRH-0
0–3 km SRH-21
Eff. SRH-21
Storm Motion309° @ 19 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.3
Thermo & Levels
PWAT2.18 in
0–3 km LR7.0 °C/km
700–500 LR6.1 °C/km
Total Totals48.6
LCL888 hPa
LFC824 hPa
EL136 hPa
Freezing Lvl15,833 ft