Extreme Heat Warning — Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL 7:00 PM Heat Advisory — Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL 7:00 PM

Clay County, Illinois, United States

Last updated: 1:53 AM CDT  ·  Refresh
25°C
Feels like 27°
Clear
▲ 37°  /  ▼ 23°
Wind
4 mph SSW
Humidity
72%
Dew Point
20°
Pressure
29.48 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:24 AM
Sunset
7:20 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Clay County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 915 J/kg) — isolated convective development possible. Sunrise: 6:24AM · Sunset: 7:20PM.

Alerts

Extreme Heat Warning
Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL
Expires 7:00 PM
Heat Advisory
Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL
Expires 7:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
8%
2 AM
25°
8%
3 AM
24°
3%
4 AM
24°
3%
5 AM
22°
3%
6 AM
22°
3%
7 AM
24°
3%
8 AM
27°
3%
9 AM
31°
3%
10 AM
33°
3%
11 AM
34°
3%
12 PM
35°
3%
1 PM
37°
3%
2 PM
37°
3%
3 PM
37°
3%
4 PM
36°
3%
5 PM
37°
3%
6 PM
36°
3%
7 PM
35°
3%
8 PM
33°
3%
9 PM
29°
3%
10 PM
28°
3%
11 PM
28°
3%
12 AM
28°
3%
7-Day Forecast
Today
37° 23°
Clear.
Fri
41° 23°
Clear with a 26% chance of rain.
Sat
40° 23°
Partly Cloudy.
Sun
34° 18°
Partly Cloudy.
Mon
37° 14°
Clear.
Tue
41° 18°
Clear.
Wed
42° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 25° Clear 8% 4 mph SSW 72%
2 AM 25° Clear 8% 5 mph SSW 70%
3 AM 24° Clear 3% 4 mph S 72%
4 AM 24° Clear 3% 5 mph S 75%
5 AM 22° Clear 3% 5 mph SSW 78%
6 AM 22° Clear 3% 4 mph SSW 80%
7 AM 24° Clear 3% 5 mph SSW 73%
8 AM 27° Clear 3% 6 mph SW 64%
9 AM 31° Clear 3% 7 mph SW 55%
10 AM 33° Clear 3% 8 mph SW 48%
11 AM 34° Clear 3% 8 mph SW 43%
12 PM 35° Clear 3% 8 mph WSW 39%
1 PM 37° Clear 3% 8 mph SW 37%
2 PM 37° Clear 3% 8 mph WSW 36%
3 PM 37° Mostly Clear 3% 7 mph WSW 35%
4 PM 36° Mostly Clear 3% 6 mph SW 38%
5 PM 37° Clear 3% 4 mph SSW 43%
6 PM 36° Clear 3% 4 mph S 49%
7 PM 35° Clear 3% 5 mph S 52%
8 PM 33° Clear 3% 6 mph S 54%
9 PM 29° Clear 3% 6 mph S 55%
10 PM 28° Clear 3% 6 mph S 56%
11 PM 28° Clear 3% 6 mph S 57%
12 AM 28° Clear 3% 6 mph S 59%
15-Day Forecast
Today
9/3
Clear
8%
23°
37°
Fri
9/4
Clear
26%
23°
41°
Sat
9/5
Partly Cloudy
16%
23°
40°
Sun
9/6
Partly Cloudy
14%
18°
34°
Mon
9/7
Clear
8%
14°
37°
Tue
9/8
Clear
8%
18°
41°
Wed
9/9
Clear
17%
23°
42°
Thu
9/10
Rain
69%
21°
42°
Fri
9/11
Drizzle
44%
21°
41°
Sat
9/12
Drizzle
51%
21°
41°
Sun
9/13
Drizzle
60%
20°
36°
Mon
9/14
Drizzle
60%
20°
36°
Tue
9/15
Drizzle
60%
19°
35°
Wed
9/16
Drizzle
60%
18°
33°
Thu
9/17
Drizzle
60%
17°
33°
52
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
52 AQI 9.4 µg/m³
O3
Ground-level ozone
44 AQI 49 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 44 52
Fri 53 Moderate 44 53
Sat 52 Moderate 49 52
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 Thu Sep 3, 05:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE24 J/kg
MLCAPE41 J/kg
MUCAPE475 J/kg
SBCIN-642 J/kg
MLCIN-372 J/kg
Lifted Index-0.3
Kinematics
0–6 km Shear11 kt
0–1 km Shear15 kt
Eff. Shear9 kt
0–1 km SRH37
0–3 km SRH28
Eff. SRH-1
Storm Motion334° @ 8 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index25.5
Thermo & Levels
PWAT1.36 in
0–3 km LR4.7 °C/km
700–500 LR6.2 °C/km
Total Totals43.2
LCL925 hPa
LFC525 hPa
EL325 hPa
Freezing Lvl15,942 ft