Jefferson County, Illinois, United States

Last updated: 2:09 PM CDT  ·  Refresh
12°C
Feels like 7°
Partly Cloudy
▲ 12°  /  ▼ 1°
Wind
12 mph NNW
Humidity
55%
Dew Point
3°
Pressure
29.63 inHg
Visibility
10 mi
UV Index
5.0
Cloud Cover
55%
Sunrise
6:26 AM
Sunset
4:50 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Jefferson County is currently partly cloudy at 12°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:26AM · Sunset: 4:50PM.

Alerts

No active alerts for this location.
28 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
12°
0%
3 PM
11°
0%
4 PM
12°
0%
5 PM
11°
0%
6 PM
9°
0%
7 PM
9°
0%
8 PM
6°
0%
9 PM
6°
0%
10 PM
4°
0%
11 PM
4°
0%
12 AM
3°
0%
1 AM
3°
0%
2 AM
3°
0%
3 AM
2°
0%
4 AM
2°
0%
5 AM
1°
0%
6 AM
1°
0%
7 AM
2°
0%
8 AM
2°
0%
9 AM
4°
0%
10 AM
6°
0%
11 AM
7°
0%
12 PM
9°
0%
1 PM
10°
0%
7-Day Forecast
Today
12° 1°
Partly Cloudy.
Sat
13° 1°
Partly Cloudy.
Sun
18° 3°
Partly Cloudy.
Mon
19° 8°
Clear.
Tue
19° 8°
Clear.
Wed
17° 7°
Partly Cloudy with a 37% chance of rain.
Thu
13° 3°
Overcast with a 34% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 12° Partly Cloudy 0% 12 mph NNW 55%
3 PM 11° Partly Cloudy 0% 12 mph NNW 53%
4 PM 12° Partly Cloudy 0% 11 mph NNW 55%
5 PM 11° Partly Cloudy 0% 9 mph NNW 58%
6 PM 9° Partly Cloudy 0% 7 mph NNW 60%
7 PM 9° Mostly Clear 0% 6 mph NNW 64%
8 PM 6° Clear 0% 5 mph NNW 68%
9 PM 6° Clear 0% 5 mph NNW 73%
10 PM 4° Clear 0% 5 mph NNW 76%
11 PM 4° Clear 0% 4 mph NNW 79%
12 AM 3° Clear 0% 4 mph NNW 81%
1 AM 3° Clear 0% 4 mph N 81%
2 AM 3° Clear 0% 4 mph NNW 83%
3 AM 2° Clear 0% 4 mph NNW 85%
4 AM 2° Clear 0% 3 mph NNW 87%
5 AM 1° Clear 0% 3 mph NNW 89%
6 AM 1° Clear 0% 3 mph NNW 89%
7 AM 2° Clear 0% 3 mph NNW 88%
8 AM 2° Mostly Clear 0% 3 mph NNW 80%
9 AM 4° Mostly Clear 0% 4 mph NNW 69%
10 AM 6° Partly Cloudy 0% 4 mph NNW 61%
11 AM 7° Partly Cloudy 0% 5 mph NNW 57%
12 PM 9° Partly Cloudy 0% 5 mph NNW 53%
1 PM 10° Partly Cloudy 0% 5 mph NNW 51%
15-Day Forecast
Today
11/6
Partly Cloudy
0%
1°
12°
Sat
11/7
Partly Cloudy
0%
1°
13°
Sun
11/8
Partly Cloudy
3%
3°
18°
Mon
11/9
Clear
3%
8°
19°
Tue
11/10
Clear
3%
8°
19°
Wed
11/11
Partly Cloudy
37%
7°
17°
Thu
11/12
Overcast
34%
3°
13°
Fri
11/13
Partly Cloudy
13%
0°
9°
Sat
11/14
Partly Cloudy
22%
-2°
9°
Sun
11/15
Mostly Cloudy
52%
-1°
12°
Mon
11/16
Overcast
82%
2°
14°
Tue
11/17
Drizzle
83%
8°
14°
Wed
11/18
Drizzle
78%
8°
14°
Thu
11/19
Drizzle
71%
7°
14°
Fri
11/20
Drizzle
70%
7°
13°
28
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
19 AQI 3.6 µg/m³
O3
Ground-level ozone
Dominant
28 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 28 Good 28 19
Sun 36 Good 26 36
Mon 44 Good 29 44
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 Fri Nov 6, 18:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE69 J/kg
MLCAPE13 J/kg
MUCAPE0 J/kg
SBCIN0 J/kg
MLCIN-1 J/kg
Lifted Index13.7
Kinematics
0–6 km Shear18 kt
0–1 km Shear6 kt
Eff. Shear—
0–1 km SRH18
0–3 km SRH37
Eff. SRH—
Storm Motion348° @ 30 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-22.8
Thermo & Levels
PWAT0.35 in
0–3 km LR3.0 °C/km
700–500 LR7.7 °C/km
Total Totals28.3
LCL880 hPa
LFC1003 hPa
EL851 hPa
Freezing Lvl3,474 ft