Jefferson County, Missouri, United States

Last updated: 2:08 PM CDT · Refresh

12°C

Feels like 8°

Mostly Cloudy

▲ 12° / ▼ 1°

Wind

7 mph NNW

Humidity

66%

Dew Point

6°

Pressure

29.45 inHg

Visibility

9 mi

UV Index

3.7

Cloud Cover

79%

Sunrise

6:32 AM

Sunset

4:57 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Jefferson County is currently mostly cloudy at 12°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:32AM · Sunset: 4:57PM.

27 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

12°

3 PM

12°

4 PM

12°

5 PM

11°

6 PM

9°

7 PM

8°

8 PM

8°

9 PM

7°

10 PM

6°

11 PM

5°

12 AM

5°

1 AM

4°

2 AM

4°

3 AM

3°

4 AM

1°

5 AM

1°

6 AM

1°

7 AM

1°

8 AM

3°

9 AM

5°

10 AM

7°

11 AM

8°

12 PM

9°

1 PM

12°

7-Day Forecast

Today

12° 1°

Mostly Cloudy.

Sat

13° 1°

Partly Cloudy.

Sun

19° 3°

Clear.

Mon

21° 7°

Clear.

Tue

19° 8°

Clear.

Wed

17° 7°

Mostly Clear with a 33% chance of rain.

Thu

14° 3°

Mostly Cloudy with a 34% chance of rain.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 12° Mostly Cloudy 0% 7 mph NNW 66%

3 PM 12° Mostly Cloudy 0% 7 mph NNW 66%

4 PM 12° Mostly Cloudy 0% 6 mph NNW 64%

5 PM 11° Partly Cloudy 0% 6 mph NNW 69%

6 PM 9° Partly Cloudy 0% 5 mph N 73%

7 PM 8° Partly Cloudy 0% 4 mph N 76%

8 PM 8° Partly Cloudy 0% 4 mph N 75%

9 PM 7° Partly Cloudy 0% 4 mph N 76%

10 PM 6° Mostly Clear 0% 4 mph N 80%

11 PM 5° Mostly Clear 0% 3 mph NNW 83%

12 AM 5° Mostly Clear 0% 2 mph NNW 84%

1 AM 4° Mostly Clear 0% 2 mph NW 85%

2 AM 4° Mostly Clear 0% 2 mph NW 86%

3 AM 3° Clear 0% 2 mph WNW 88%

4 AM 1° Clear 0% 2 mph WNW 89%

5 AM 1° Mostly Clear 0% 2 mph NW 90%

6 AM 1° Mostly Clear 0% 2 mph WNW 91%

7 AM 1° Mostly Clear 0% 2 mph WNW 90%

8 AM 3° Mostly Clear 0% 3 mph NW 86%

9 AM 5° Partly Cloudy 0% 3 mph NW 77%

10 AM 7° Partly Cloudy 0% 3 mph NW 68%

11 AM 8° Partly Cloudy 0% 3 mph NW 63%

12 PM 9° Partly Cloudy 0% 3 mph NW 59%

1 PM 12° Mostly Cloudy 0% 3 mph NW 51%

15-Day Forecast

Today

11/6

Mostly Cloudy

1°

12°

Sat

11/7

Partly Cloudy

1°

13°

Sun

11/8

Clear

3°

19°

Mon

11/9

Clear

7°

21°

Tue

11/10

Clear

8°

19°

Wed

11/11

Mostly Clear

33%

7°

17°

Thu

11/12

Mostly Cloudy

34%

3°

14°

Fri

11/13

Mostly Cloudy

30%

1°

9°

Sat

11/14

Mostly Clear

24%

-2°

10°

Sun

11/15

Mostly Cloudy

48%

-2°

13°

Mon

11/16

Overcast

84%

4°

15°

Tue

11/17

Drizzle

76%

8°

15°

Wed

11/18

Drizzle

83%

7°

14°

Thu

11/19

Drizzle

70%

7°

14°

Fri

11/20

Drizzle

73%

7°

13°

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

17 AQI 3.2 µg/m³

O₃

Ground-level ozone

Dominant

27 AQI 29 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Sat 27 Good 27 17

Sun 36 Good 24 36

Mon 29 Good 29 27

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

SBCAPE45 J/kg

MLCAPE15 J/kg

MUCAPE0 J/kg

SBCIN0 J/kg

MLCIN-1 J/kg

Lifted Index11.0

Kinematics

0–6 km Shear15 kt

0–1 km Shear5 kt

Eff. Shear—

0–1 km SRH14

0–3 km SRH43

Eff. SRH—

Storm Motion2° @ 25 kt

0–1 km EHI0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)—

Supercell—

K-Index-13.3

Thermo & Levels

PWAT0.43 in

0–3 km LR3.1 °C/km

700–500 LR7.7 °C/km

Total Totals33.7

LCL915 hPa

LFC997 hPa

EL845 hPa

Freezing Lvl10,892 ft

Jefferson County, Missouri, United States

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