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

Knox County, Illinois, United States

Last updated: 1:55 AM CDT  ·  Refresh
25°C
Feels like 27°
Clear
▲ 35°  /  ▼ 23°
Wind
5 mph SSW
Humidity
73%
Dew Point
21°
Pressure
29.17 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
Sunrise
6:29 AM
Sunset
7:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Knox County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2740 J/kg) — isolated convective development possible. Sunrise: 6:29AM · Sunset: 7:29PM.

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
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
10%
2 AM
24°
10%
3 AM
24°
4%
4 AM
24°
4%
5 AM
22°
4%
6 AM
21°
4%
7 AM
23°
4%
8 AM
26°
4%
9 AM
28°
4%
10 AM
30°
3%
11 AM
31°
3%
12 PM
32°
3%
1 PM
35°
3%
2 PM
35°
3%
3 PM
35°
3%
4 PM
34°
3%
5 PM
33°
3%
6 PM
32°
3%
7 PM
31°
3%
8 PM
30°
3%
9 PM
28°
3%
10 PM
28°
5%
11 PM
27°
5%
12 AM
27°
5%
7-Day Forecast
Today
35° 23°
Clear.
Fri
37° 23°
Clear with a 26% chance of rain.
Sat
36° 21°
Clear with a 26% chance of rain.
Sun
29° 18°
Fog.
Mon
31° 14°
Clear.
Tue
35° 18°
Drizzle, 43% chance.
Wed
37° 21°
Clear with a 31% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Clear 10% 5 mph SSW 73%
2 AM 24° Clear 10% 6 mph SSW 69%
3 AM 24° Clear 4% 6 mph SSW 70%
4 AM 24° Clear 4% 6 mph S 73%
5 AM 22° Clear 4% 6 mph S 76%
6 AM 21° Clear 4% 6 mph S 79%
7 AM 23° Clear 4% 7 mph SSW 76%
8 AM 26° Clear 4% 8 mph SW 70%
9 AM 28° Clear 4% 10 mph SW 65%
10 AM 30° Clear 3% 9 mph SW 62%
11 AM 31° Clear 3% 9 mph SW 58%
12 PM 32° Mostly Clear 3% 9 mph WSW 55%
1 PM 35° Clear 3% 8 mph SW 54%
2 PM 35° Clear 3% 6 mph SW 53%
3 PM 35° Clear 3% 7 mph SW 52%
4 PM 34° Clear 3% 6 mph SSW 56%
5 PM 33° Clear 3% 6 mph S 61%
6 PM 32° Clear 3% 7 mph S 66%
7 PM 31° Clear 3% 7 mph S 68%
8 PM 30° Clear 3% 7 mph S 69%
9 PM 28° Clear 3% 7 mph S 69%
10 PM 28° Clear 5% 7 mph S 69%
11 PM 27° Mostly Clear 5% 7 mph SSW 69%
12 AM 27° Mostly Clear 5% 7 mph SSW 70%
15-Day Forecast
Today
9/3
Clear
10%
23°
35°
Fri
9/4
Clear
26%
23°
37°
Sat
9/5
Clear
26%
21°
36°
Sun
9/6
Fog
17%
18°
29°
Mon
9/7
Clear
16%
14°
31°
Tue
9/8
Drizzle
43%
18°
35°
Wed
9/9
Clear
31%
21°
37°
Thu
9/10
Drizzle
53%
19°
34°
Fri
9/11
Drizzle
68%
19°
36°
Sat
9/12
Drizzle
51%
20°
36°
Sun
9/13
Drizzle
60%
19°
31°
Mon
9/14
Drizzle
60%
18°
32°
Tue
9/15
Drizzle
60%
17°
30°
Wed
9/16
Drizzle
60%
16°
28°
Thu
9/17
Drizzle
60%
16°
28°
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 10.8 µg/m³
O3
Ground-level ozone
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 40 54
Fri 37 Good 36 37
Sat 41 Good 41 36
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 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE484 J/kg
MLCAPE213 J/kg
MUCAPE965 J/kg
SBCIN-445 J/kg
MLCIN-241 J/kg
Lifted Index-1.7
Kinematics
0–6 km Shear23 kt
0–1 km Shear18 kt
Eff. Shear18 kt
0–1 km SRH93
0–3 km SRH42
Eff. SRH-12
Storm Motion315° @ 16 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.1
Thermo & Levels
PWAT1.36 in
0–3 km LR5.0 °C/km
700–500 LR5.9 °C/km
Total Totals43.7
LCL932 hPa
LFC682 hPa
EL240 hPa
Freezing Lvl15,443 ft