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

Mason County, Illinois, United States

Last updated: 1:54 AM CDT  ·  Refresh
26°C
Feels like 27°
Clear
▲ 36°  /  ▼ 23°
Wind
7 mph S
Humidity
67%
Dew Point
20°
Pressure
29.39 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:29 AM
Sunset
7:27 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently clear at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1898 J/kg) — isolated convective development possible. Sunrise: 6:29AM · Sunset: 7:27PM.

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
53 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
8%
2 AM
25°
8%
3 AM
24°
3%
4 AM
24°
3%
5 AM
23°
3%
6 AM
23°
3%
7 AM
24°
3%
8 AM
27°
7%
9 AM
28°
7%
10 AM
30°
7%
11 AM
31°
8%
12 PM
33°
8%
1 PM
36°
8%
2 PM
36°
8%
3 PM
36°
8%
4 PM
34°
8%
5 PM
35°
3%
6 PM
34°
3%
7 PM
33°
3%
8 PM
32°
3%
9 PM
28°
3%
10 PM
27°
3%
11 PM
27°
3%
12 AM
27°
3%
7-Day Forecast
Today
36° 23°
Mostly Clear.
Fri
39° 23°
Mostly Clear.
Sat
39° 23°
Mostly Clear.
Sun
31° 18°
Fog.
Mon
33° 15°
Clear.
Tue
38° 18°
Clear.
Wed
42° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 8% 7 mph S 67%
2 AM 25° Clear 8% 7 mph SSW 64%
3 AM 24° Clear 3% 7 mph SSW 67%
4 AM 24° Clear 3% 7 mph SSW 70%
5 AM 23° Clear 3% 7 mph SSW 72%
6 AM 23° Clear 3% 7 mph SSW 74%
7 AM 24° Clear 3% 8 mph SSW 70%
8 AM 27° Mostly Clear 7% 10 mph SW 64%
9 AM 28° Mostly Clear 7% 10 mph SW 59%
10 AM 30° Mostly Clear 7% 10 mph SW 54%
11 AM 31° Clear 8% 9 mph SW 49%
12 PM 33° Clear 8% 10 mph SW 44%
1 PM 36° Clear 8% 9 mph SW 43%
2 PM 36° Mostly Clear 8% 9 mph SW 42%
3 PM 36° Mostly Clear 8% 9 mph SSW 41%
4 PM 34° Mostly Clear 8% 8 mph SSW 45%
5 PM 35° Mostly Clear 3% 7 mph S 50%
6 PM 34° Clear 3% 7 mph SSE 56%
7 PM 33° Clear 3% 7 mph SSE 59%
8 PM 32° Clear 3% 7 mph S 61%
9 PM 28° Clear 3% 7 mph S 62%
10 PM 27° Clear 3% 7 mph S 63%
11 PM 27° Clear 3% 7 mph S 64%
12 AM 27° Clear 3% 7 mph S 66%
15-Day Forecast
Today
9/3
Mostly Clear
8%
23°
36°
Fri
9/4
Mostly Clear
6%
23°
39°
Sat
9/5
Mostly Clear
13%
23°
39°
Sun
9/6
Fog
17%
18°
31°
Mon
9/7
Clear
16%
15°
33°
Tue
9/8
Clear
17%
18°
38°
Wed
9/9
Clear
17%
23°
42°
Thu
9/10
Drizzle
43%
20°
38°
Fri
9/11
Drizzle
68%
20°
39°
Sat
9/12
Drizzle
66%
21°
38°
Sun
9/13
Drizzle
60%
19°
33°
Mon
9/14
Drizzle
60%
19°
33°
Tue
9/15
Drizzle
60%
18°
31°
Wed
9/16
Drizzle
60%
17°
30°
Thu
9/17
Drizzle
60%
17°
29°
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
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 53 Moderate 38 53
Fri 40 Good 37 40
Sat 39 Good 39 38
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
SBCAPE79 J/kg
MLCAPE237 J/kg
MUCAPE518 J/kg
SBCIN-599 J/kg
MLCIN-267 J/kg
Lifted Index-0.6
Kinematics
0–6 km Shear21 kt
0–1 km Shear10 kt
Eff. Shear17 kt
0–1 km SRH60
0–3 km SRH73
Eff. SRH3
Storm Motion313° @ 14 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index25.3
Thermo & Levels
PWAT1.31 in
0–3 km LR5.4 °C/km
700–500 LR5.8 °C/km
Total Totals47.0
LCL906 hPa
LFC523 hPa
EL294 hPa
Freezing Lvl16,060 ft