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

Mason County, Illinois, United States

Last updated: 11:45 PM CDT  ·  Refresh
27°C
Feels like 28°
Clear
▲ 32°  /  ▼ 21°
Wind
8 mph SSW
Humidity
65%
Dew Point
20°
Pressure
29.40 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:26 AM
Sunset
7:32 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently clear at 27°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1366 J/kg) — isolated convective development possible. Sunrise: 6:26AM · Sunset: 7:32PM.

Alerts

Heat Advisory
Knox, IL, Stark, IL, Peoria, IL, Fulton, IL, Tazewell, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL, Marshall, IL, Woodford, IL, McLean, IL, Champaign, IL, Vermilion, IL, Edgar, IL
Expires 7:00 PM
58 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
27°
5%
12 AM
26°
5%
1 AM
26°
5%
2 AM
25°
5%
3 AM
24°
5%
4 AM
24°
3%
5 AM
23°
3%
6 AM
22°
3%
7 AM
24°
3%
8 AM
27°
3%
9 AM
29°
3%
10 AM
31°
3%
11 AM
33°
3%
12 PM
34°
3%
1 PM
37°
3%
2 PM
37°
3%
3 PM
38°
3%
4 PM
37°
3%
5 PM
37°
3%
6 PM
35°
3%
7 PM
34°
3%
8 PM
33°
3%
9 PM
30°
3%
10 PM
29°
3%
7-Day Forecast
Tonight
32° 21°
Clear.
Tue
38° 22°
Clear.
Wed
41° 22°
Mostly Clear.
Thu
39° 22°
Mostly Clear with a 37% chance of rain.
Fri
41° 23°
Fog with a 60% chance of rain.
Sat
41° 23°
Rain, 81% chance.
Sun
39° 20°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 27° Clear 5% 8 mph SSW 65%
12 AM 26° Clear 5% 9 mph SSW 60%
1 AM 26° Clear 5% 9 mph SSW 63%
2 AM 25° Clear 5% 8 mph SSW 66%
3 AM 24° Clear 5% 8 mph SSW 69%
4 AM 24° Clear 3% 7 mph SSW 71%
5 AM 23° Clear 3% 7 mph SSW 73%
6 AM 22° Clear 3% 7 mph SW 74%
7 AM 24° Clear 3% 7 mph SW 70%
8 AM 27° Mostly Clear 3% 8 mph SW 62%
9 AM 29° Partly Cloudy 3% 9 mph WSW 54%
10 AM 31° Mostly Clear 3% 9 mph WSW 49%
11 AM 33° Clear 3% 8 mph WSW 44%
12 PM 34° Clear 3% 8 mph WSW 39%
1 PM 37° Clear 3% 8 mph WSW 36%
2 PM 37° Clear 3% 7 mph WSW 34%
3 PM 38° Clear 3% 7 mph SW 32%
4 PM 37° Clear 3% 7 mph SW 34%
5 PM 37° Clear 3% 7 mph SSW 39%
6 PM 35° Clear 3% 8 mph SSW 43%
7 PM 34° Clear 3% 8 mph SSW 47%
8 PM 33° Clear 3% 8 mph SSW 51%
9 PM 30° Clear 3% 8 mph SSW 56%
10 PM 29° Clear 3% 8 mph SSW 58%
15-Day Forecast
Today
8/31
Clear
5%
21°
32°
Tue
9/1
Clear
5%
22°
38°
Wed
9/2
Mostly Clear
7%
22°
41°
Thu
9/3
Mostly Clear
37%
22°
39°
Fri
9/4
Fog
60%
23°
41°
Sat
9/5
Rain
81%
23°
41°
Sun
9/6
Clear
19%
20°
39°
Mon
9/7
Clear
19%
18°
38°
Tue
9/8
Drizzle
60%
19°
39°
Wed
9/9
Drizzle
60%
20°
39°
Thu
9/10
Drizzle
60%
19°
36°
Fri
9/11
Drizzle
60%
19°
34°
Sat
9/12
Drizzle
60%
17°
32°
Sun
9/13
Drizzle
60%
17°
32°
Mon
9/14
Drizzle
60%
17°
31°
58
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
58 AQI 12.7 µg/m³
O3
Ground-level ozone
46 AQI 50 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 58 Moderate 46 58
Wed 60 Moderate 48 60
Thu 47 Good 40 47
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 Tue Sep 1, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE175 J/kg
MLCAPE189 J/kg
MUCAPE610 J/kg
SBCIN-698 J/kg
MLCIN-415 J/kg
Lifted Index-0.8
Kinematics
0–6 km Shear22 kt
0–1 km Shear21 kt
Eff. Shear22 kt
0–1 km SRH143
0–3 km SRH129
Eff. SRH14
Storm Motion311° @ 16 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.1
K-Index36.4
Thermo & Levels
PWAT1.73 in
0–3 km LR4.6 °C/km
700–500 LR6.7 °C/km
Total Totals46.9
LCL903 hPa
LFC586 hPa
EL248 hPa
Freezing Lvl15,646 ft