Jefferson County, Illinois, United States

Last updated: 1:20 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

5.4

Cloud Cover

58%

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.

28 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

12°

2 PM

12°

3 PM

11°

4 PM

12°

5 PM

11°

6 PM

9°

7 PM

8°

8 PM

6°

9 PM

5°

10 PM

4°

11 PM

4°

12 AM

3°

1 AM

3°

2 AM

2°

3 AM

2°

4 AM

1°

5 AM

1°

6 AM

1°

7 AM

2°

8 AM

3°

9 AM

5°

10 AM

6°

11 AM

7°

12 PM

9°

7-Day Forecast

Today

12° 1°

Partly Cloudy.

Sat

13° 1°

Partly Cloudy.

Sun

18° 3°

Mostly Clear.

Mon

20° 8°

Clear.

Tue

20° 8°

Clear.

Wed

17° 7°

Partly Cloudy with a 39% chance of rain.

Thu

13° 3°

Overcast with a 35% chance of rain.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 12° Partly Cloudy 0% 12 mph NNW 55%

2 PM 12° Partly Cloudy 0% 12 mph NNW 54%

3 PM 11° Partly Cloudy 0% 12 mph NNW 52%

4 PM 12° Partly Cloudy 0% 10 mph NNW 54%

5 PM 11° Partly Cloudy 0% 8 mph NNW 57%

6 PM 9° Mostly Clear 0% 7 mph NNW 61%

7 PM 8° Clear 0% 5 mph NNW 65%

8 PM 6° Clear 0% 5 mph NNW 69%

9 PM 5° Clear 0% 5 mph NNW 73%

10 PM 4° Clear 0% 5 mph NNW 76%

11 PM 4° Clear 0% 4 mph NNW 78%

12 AM 3° Clear 0% 4 mph NNW 80%

1 AM 3° Clear 0% 4 mph N 81%

2 AM 2° Clear 0% 3 mph N 83%

3 AM 2° Clear 0% 3 mph N 86%

4 AM 1° Clear 0% 3 mph NNW 88%

5 AM 1° Clear 0% 3 mph NNW 89%

6 AM 1° Mostly Clear 0% 3 mph NNW 89%

7 AM 2° Clear 0% 3 mph NNW 86%

8 AM 3° Mostly Clear 0% 3 mph NNW 78%

9 AM 5° Partly Cloudy 0% 4 mph NNW 68%

10 AM 6° Partly Cloudy 0% 4 mph NNW 61%

11 AM 7° Partly Cloudy 0% 4 mph NNW 57%

12 PM 9° Partly Cloudy 0% 5 mph NNW 54%

15-Day Forecast

Today

11/6

Partly Cloudy

1°

12°

Sat

11/7

Partly Cloudy

1°

13°

Sun

11/8

Mostly Clear

3°

18°

Mon

11/9

Clear

8°

20°

Tue

11/10

Clear

8°

20°

Wed

11/11

Partly Cloudy

39%

7°

17°

Thu

11/12

Overcast

35%

3°

13°

Fri

11/13

Partly Cloudy

14%

0°

9°

Sat

11/14

Partly Cloudy

25%

-1°

10°

Sun

11/15

Partly Cloudy

52%

-2°

13°

Mon

11/16

Overcast

81%

2°

15°

Tue

11/17

Drizzle

84%

8°

15°

Wed

11/18

Drizzle

78%

8°

15°

Thu

11/19

Drizzle

72%

7°

14°

Fri

11/20

Drizzle

70%

7°

14°

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

PM_2.5

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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

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

0–1 1–3 3–6 6–9 km

Instability

SBCAPE77 J/kg

MLCAPE14 J/kg

MUCAPE0 J/kg

SBCIN0 J/kg

MLCIN-1 J/kg

Lifted Index13.5

Kinematics

0–6 km Shear18 kt

0–1 km Shear5 kt

Eff. Shear—

0–1 km SRH16

0–3 km SRH34

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

LCL879 hPa

LFC1003 hPa

EL850 hPa

Freezing Lvl3,478 ft

Jefferson County, Illinois, United States

Alerts