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

Hamilton County, Illinois, United States

Last updated: 2:24 AM CDT  ·  Refresh
24°C
Feels like 27°
Fog
▲ 38°  /  ▼ 24°
Wind
3 mph S
Humidity
75%
Dew Point
21°
Pressure
29.49 inHg
Visibility
0 mi
UV Index
0.0
Cloud Cover
41%
Sunrise
6:26 AM
Sunset
7:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Hamilton County is currently fog at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2080 J/kg) — isolated convective development possible. Sunrise: 6:26AM · Sunset: 7:18PM.

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
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
13%
3 AM
25°
4%
4 AM
24°
4%
5 AM
23°
4%
6 AM
22°
4%
7 AM
23°
4%
8 AM
26°
4%
9 AM
30°
4%
10 AM
33°
4%
11 AM
34°
5%
12 PM
35°
5%
1 PM
37°
5%
2 PM
37°
7%
3 PM
37°
19%
4 PM
36°
28%
5 PM
37°
18%
6 PM
36°
18%
7 PM
35°
18%
8 PM
34°
18%
9 PM
28°
19%
10 PM
28°
9%
11 PM
27°
9%
12 AM
27°
9%
1 AM
27°
9%
7-Day Forecast
Today
38° 24°
Mostly Clear.
Sat
41° 24°
Partly Cloudy with a 49% chance of rain.
Sun
36° 17°
Partly Cloudy.
Mon
33° 12°
Mostly Cloudy.
Tue
39° 17°
Clear.
Wed
42° 22°
Drizzle, 38% chance.
Thu
38° 18°
Clear with a 31% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Fog 13% 3 mph S 75%
3 AM 25° Partly Cloudy 4% 4 mph SSW 73%
4 AM 24° Partly Cloudy 4% 3 mph SSW 74%
5 AM 23° Partly Cloudy 4% 3 mph SSW 76%
6 AM 22° Mostly Clear 4% 4 mph S 78%
7 AM 23° Mostly Clear 4% 3 mph SSW 76%
8 AM 26° Clear 4% 3 mph SW 67%
9 AM 30° Clear 4% 4 mph SW 57%
10 AM 33° Clear 4% 5 mph WSW 49%
11 AM 34° Clear 5% 5 mph WSW 44%
12 PM 35° Mostly Clear 5% 5 mph WSW 40%
1 PM 37° Mostly Clear 5% 4 mph SW 38%
2 PM 37° Partly Cloudy 7% 5 mph SSW 38%
3 PM 37° Partly Cloudy 19% 6 mph S 39%
4 PM 36° Partly Cloudy 28% 6 mph S 41%
5 PM 37° Partly Cloudy 18% 6 mph S 44%
6 PM 36° Partly Cloudy 18% 5 mph S 49%
7 PM 35° Mostly Clear 18% 4 mph S 54%
8 PM 34° Mostly Clear 18% 5 mph S 59%
9 PM 28° Clear 19% 6 mph S 64%
10 PM 28° Clear 9% 6 mph S 67%
11 PM 27° Clear 9% 6 mph S 68%
12 AM 27° Clear 9% 5 mph SSW 70%
1 AM 27° Clear 9% 6 mph SSW 71%
15-Day Forecast
Today
9/4
Mostly Clear
18%
24°
38°
Sat
9/5
Partly Cloudy
49%
24°
41°
Sun
9/6
Partly Cloudy
13%
17°
36°
Mon
9/7
Mostly Cloudy
3%
12°
33°
Tue
9/8
Clear
3%
17°
39°
Wed
9/9
Drizzle
38%
22°
42°
Thu
9/10
Clear
31%
18°
38°
Fri
9/11
Rain
69%
15°
37°
Sat
9/12
Rain
42%
21°
40°
Sun
9/13
Clear
44%
17°
36°
Mon
9/14
Clear
60%
21°
38°
Tue
9/15
Drizzle
60%
22°
38°
Wed
9/16
Drizzle
60%
21°
37°
Thu
9/17
Clear
60%
19°
34°
Fri
9/18
Clear
25%
18°
34°
54
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
54 AQI 10.5 µg/m³
O3
Ground-level ozone
47 AQI 51 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 47 54
Sat 55 Moderate 45 55
Sun 55 Moderate 45 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
SBCAPE155 J/kg
MLCAPE668 J/kg
MUCAPE1013 J/kg
SBCIN-515 J/kg
MLCIN-174 J/kg
Lifted Index-0.4
Kinematics
0–6 km Shear8 kt
0–1 km Shear11 kt
Eff. Shear4 kt
0–1 km SRH15
0–3 km SRH9
Eff. SRH-5
Storm Motion352° @ 9 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index37.0
Thermo & Levels
PWAT1.70 in
0–3 km LR5.1 °C/km
700–500 LR5.2 °C/km
Total Totals46.9
LCL947 hPa
LFC528 hPa
EL310 hPa
Freezing Lvl16,493 ft