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

Union County, Kentucky, United States

Last updated: 2:25 AM CDT  ·  Refresh
25°C
Feels like 28°
Clear
▲ 37°  /  ▼ 23°
Wind
2 mph S
Humidity
80%
Dew Point
21°
Pressure
29.51 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:24 AM
Sunset
7:16 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2330 J/kg) — isolated convective development possible. Sunrise: 6:24AM · Sunset: 7:16PM.

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
53 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
16%
3 AM
24°
4%
4 AM
24°
4%
5 AM
23°
4%
6 AM
23°
3%
7 AM
23°
3%
8 AM
26°
7%
9 AM
30°
7%
10 AM
32°
11%
11 AM
34°
16%
12 PM
34°
16%
1 PM
37°
16%
2 PM
36°
18%
3 PM
36°
13%
4 PM
35°
14%
5 PM
37°
14%
6 PM
36°
9%
7 PM
35°
9%
8 PM
34°
9%
9 PM
28°
9%
10 PM
27°
19%
11 PM
27°
19%
12 AM
27°
19%
1 AM
27°
20%
7-Day Forecast
Today
37° 23°
Clear.
Sat
39° 23°
Mostly Clear with a 55% chance of rain.
Sun
35° 18°
Partly Cloudy.
Mon
32° 13°
Partly Cloudy.
Tue
37° 19°
Clear.
Wed
41° 22°
Clear.
Thu
37° 20°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 25° Clear 16% 2 mph S 80%
3 AM 24° Clear 4% 3 mph SSE 80%
4 AM 24° Clear 4% 3 mph SSE 81%
5 AM 23° Clear 4% 3 mph S 81%
6 AM 23° Clear 3% 3 mph S 82%
7 AM 23° Clear 3% 3 mph SSW 80%
8 AM 26° Clear 7% 3 mph SSW 73%
9 AM 30° Clear 7% 3 mph SSW 63%
10 AM 32° Clear 11% 3 mph SW 56%
11 AM 34° Clear 16% 2 mph SW 51%
12 PM 34° Clear 16% 2 mph SW 46%
1 PM 37° Clear 16% 2 mph SW 44%
2 PM 36° Clear 18% 3 mph SW 47%
3 PM 36° Clear 13% 4 mph SW 49%
4 PM 35° Clear 14% 4 mph SW 51%
5 PM 37° Clear 14% 4 mph SW 53%
6 PM 36° Clear 9% 4 mph SSW 56%
7 PM 35° Clear 9% 4 mph S 59%
8 PM 34° Mostly Clear 9% 4 mph SSW 64%
9 PM 28° Mostly Clear 9% 4 mph SSW 67%
10 PM 27° Mostly Clear 19% 4 mph SSW 70%
11 PM 27° Mostly Clear 19% 4 mph SW 72%
12 AM 27° Clear 19% 4 mph SW 74%
1 AM 27° Clear 20% 4 mph SW 75%
15-Day Forecast
Today
9/4
Clear
18%
23°
37°
Sat
9/5
Mostly Clear
55%
23°
39°
Sun
9/6
Partly Cloudy
13%
18°
35°
Mon
9/7
Partly Cloudy
3%
13°
32°
Tue
9/8
Clear
3%
19°
37°
Wed
9/9
Clear
17%
22°
41°
Thu
9/10
Clear
17%
20°
37°
Fri
9/11
Rain
69%
17°
36°
Sat
9/12
Rain
44%
21°
41°
Sun
9/13
Drizzle
44%
18°
36°
Mon
9/14
Clear
60%
21°
37°
Tue
9/15
Drizzle
60%
21°
37°
Wed
9/16
Drizzle
60%
21°
37°
Thu
9/17
Drizzle
60%
19°
34°
Fri
9/18
Clear
25%
18°
34°
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
41 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 53 Moderate 41 53
Sat 58 Moderate 44 58
Sun 55 Moderate 44 55
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 4, 06:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE188 J/kg
MLCAPE510 J/kg
MUCAPE747 J/kg
SBCIN-517 J/kg
MLCIN-194 J/kg
Lifted Index-0.5
Kinematics
0–6 km Shear5 kt
0–1 km Shear10 kt
Eff. Shear2 kt
0–1 km SRH20
0–3 km SRH28
Eff. SRH19
Storm Motion332° @ 11 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index34.8
Thermo & Levels
PWAT1.62 in
0–3 km LR4.9 °C/km
700–500 LR5.3 °C/km
Total Totals47.0
LCL949 hPa
LFC544 hPa
EL303 hPa
Freezing Lvl16,407 ft