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

McLean County, Illinois, United States

Last updated: 1:54 AM CDT  ·  Refresh
25°C
Feels like 26°
Clear
▲ 34°  /  ▼ 23°
Wind
8 mph SSW
Humidity
70%
Dew Point
20°
Pressure
29.10 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:24 AM
Sunset
7:23 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: McLean County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2729 J/kg) — isolated convective development possible. Sunrise: 6:24AM · Sunset: 7:23PM.

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°
8%
2 AM
25°
8%
3 AM
24°
3%
4 AM
24°
4%
5 AM
22°
4%
6 AM
22°
4%
7 AM
24°
4%
8 AM
26°
4%
9 AM
28°
4%
10 AM
29°
3%
11 AM
30°
3%
12 PM
31°
3%
1 PM
33°
3%
2 PM
34°
6%
3 PM
34°
6%
4 PM
33°
6%
5 PM
34°
5%
6 PM
33°
3%
7 PM
32°
3%
8 PM
31°
3%
9 PM
27°
3%
10 PM
27°
3%
11 PM
27°
3%
12 AM
27°
3%
7-Day Forecast
Today
34° 23°
Clear.
Fri
37° 23°
Clear.
Sat
36° 21°
Mostly Clear with a 36% chance of rain.
Sun
28° 17°
Overcast.
Mon
30° 16°
Clear.
Tue
33° 17°
Clear.
Wed
37° 22°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 25° Clear 8% 8 mph SSW 70%
2 AM 25° Clear 8% 8 mph SSW 68%
3 AM 24° Clear 3% 8 mph SSW 71%
4 AM 24° Clear 4% 7 mph SSW 74%
5 AM 22° Clear 4% 7 mph SSW 77%
6 AM 22° Clear 4% 7 mph SSW 80%
7 AM 24° Clear 4% 8 mph SSW 77%
8 AM 26° Clear 4% 9 mph SW 72%
9 AM 28° Clear 4% 10 mph SW 68%
10 AM 29° Clear 3% 10 mph SW 65%
11 AM 30° Clear 3% 10 mph SW 62%
12 PM 31° Clear 3% 10 mph SW 58%
1 PM 33° Clear 3% 9 mph SW 57%
2 PM 34° Clear 6% 8 mph WSW 56%
3 PM 34° Clear 6% 8 mph WSW 56%
4 PM 33° Clear 6% 6 mph SW 59%
5 PM 34° Clear 5% 5 mph SW 64%
6 PM 33° Clear 3% 6 mph SSW 69%
7 PM 32° Clear 3% 6 mph S 70%
8 PM 31° Clear 3% 6 mph S 71%
9 PM 27° Clear 3% 7 mph S 72%
10 PM 27° Clear 3% 7 mph S 71%
11 PM 27° Clear 3% 7 mph S 70%
12 AM 27° Clear 3% 7 mph S 70%
15-Day Forecast
Today
9/3
Clear
8%
23°
34°
Fri
9/4
Clear
19%
23°
37°
Sat
9/5
Mostly Clear
36%
21°
36°
Sun
9/6
Overcast
16%
17°
28°
Mon
9/7
Clear
16%
16°
30°
Tue
9/8
Clear
17%
17°
33°
Wed
9/9
Clear
17%
22°
37°
Thu
9/10
Rain
69%
19°
34°
Fri
9/11
Clear
44%
19°
36°
Sat
9/12
Drizzle
51%
19°
36°
Sun
9/13
Drizzle
60%
19°
31°
Mon
9/14
Drizzle
60%
19°
32°
Tue
9/15
Drizzle
60%
17°
29°
Wed
9/16
Drizzle
60%
16°
29°
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 10.9 µg/m³
O3
Ground-level ozone
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 39 54
Fri 43 Good 41 43
Sat 45 Good 45 41
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
SBCAPE395 J/kg
MLCAPE270 J/kg
MUCAPE440 J/kg
SBCIN-418 J/kg
MLCIN-231 J/kg
Lifted Index-1.7
Kinematics
0–6 km Shear23 kt
0–1 km Shear9 kt
Eff. Shear16 kt
0–1 km SRH49
0–3 km SRH57
Eff. SRH11
Storm Motion314° @ 15 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.1
Thermo & Levels
PWAT1.34 in
0–3 km LR5.3 °C/km
700–500 LR5.8 °C/km
Total Totals46.7
LCL920 hPa
LFC588 hPa
EL249 hPa
Freezing Lvl15,535 ft