St. Clair County, Missouri, United States

Last updated: 6:19 PM CDT · Refresh

26°C

Feels like 28°

Overcast

▲ 26° / ▼ 16°

Wind

4 mph SSE

Humidity

76%

Dew Point

20°

Pressure

29.21 inHg

Visibility

10 mi

UV Index

2.7

Cloud Cover

88%

Sunrise

5:53 AM

Sunset

8:41 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: St. Clair County is currently overcast at 25°C. Precipitation is likely — peak probability 73% around 11 PM. Atmospheric instability is elevated (CAPE up to 1579 J/kg) — isolated convective development possible. Sunrise: 5:53AM · Sunset: 8:41PM.

34 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

26°

47%

7 PM

24°

51%

8 PM

24°

52%

9 PM

23°

49%

10 PM

22°

72%

11 PM

22°

72%

12 AM

21°

42%

1 AM

22°

38%

2 AM

21°

58%

3 AM

21°

42%

4 AM

21°

42%

5 AM

19°

43%

6 AM

18°

31%

7 AM

19°

37%

8 AM

20°

41%

9 AM

22°

45%

10 AM

23°

44%

11 AM

23°

43%

12 PM

24°

47%

1 PM

27°

44%

2 PM

27°

44%

3 PM

27°

45%

4 PM

27°

45%

5 PM

23°

45%

7-Day Forecast

Tonight

26° 16°

Overcast with a 49% chance of rain.

Wed

28° 18°

Mostly Cloudy with a 47% chance of rain.

Thu

28° 19°

Heavy Rain, 85% chance.

Fri

29° 19°

Rain, 85% chance.

Sat

31° 21°

Thunderstorm, 77% chance.

Sun

32° 22°

Clear.

Mon

33° 22°

Clear.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 26° Overcast 47% 4 mph SSE 76%

7 PM 24° Overcast 51% 3 mph SE 82%

8 PM 24° Rain 52% 4 mph SE 85%

9 PM 23° Rain 49% 3 mph SE 89%

10 PM 22° Heavy Rain 72% 3 mph ENE 91%

11 PM 22° Heavy Rain 72% 4 mph ENE 92%

12 AM 21° Rain 42% 3 mph SE 93%

1 AM 22° Drizzle 38% 4 mph SSE 93%

2 AM 21° Rain 58% 4 mph SSE 95%

3 AM 21° Drizzle 42% 4 mph S 96%

4 AM 21° Drizzle 42% 4 mph S 96%

5 AM 19° Drizzle 43% 4 mph S 97%

6 AM 18° Drizzle 31% 4 mph S 97%

7 AM 19° Drizzle 37% 4 mph S 96%

8 AM 20° Drizzle 41% 5 mph SSW 93%

9 AM 22° Drizzle 45% 6 mph SSW 90%

10 AM 23° Drizzle 44% 6 mph SSW 87%

11 AM 23° Mostly Cloudy 43% 5 mph SW 84%

12 PM 24° Overcast 47% 4 mph SW 82%

1 PM 27° Overcast 44% 4 mph WSW 82%

2 PM 27° Overcast 44% 5 mph WSW 84%

3 PM 27° Rain 45% 6 mph WSW 85%

4 PM 27° Rain 45% 6 mph WSW 86%

5 PM 23° Rain 45% 5 mph WSW 87%

15-Day Forecast

Today

6/23

Overcast

49%

16°

26°

Wed

6/24

Mostly Cloudy

47%

18°

28°

Thu

6/25

Heavy Rain

85%

19°

28°

Fri

6/26

Rain

85%

19°

29°

Sat

6/27

Thunderstorm

77%

21°

31°

Sun

6/28

Clear

22°

32°

Mon

6/29

Clear

13%

22°

33°

Tue

6/30

Clear

13%

22°

33°

Wed

7/1

Clear

29%

22°

34°

Thu

7/2

Rain

67%

21°

32°

Fri

7/3

Drizzle

67%

22°

36°

Sat

7/4

Thunderstorm

54%

23°

36°

Sun

7/5

Thunderstorm

66%

22°

36°

Mon

7/6

Thunderstorm

66%

21°

36°

Tue

7/7

Thunderstorm

66%

21°

36°

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

14 AQI 2.6 µg/m³

O₃

Ground-level ozone

Dominant

34 AQI 37 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Wed 34 Good 34 14

Thu 33 Good 33 26

Fri 35 Good 35 32

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 Tue Jun 23, 22:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE1243 J/kg

MLCAPE584 J/kg

MUCAPE1243 J/kg

SBCIN-9 J/kg

MLCIN0 J/kg

Lifted Index-5.4

Kinematics

0–6 km Shear26 kt

0–1 km Shear6 kt

Eff. Shear26 kt

0–1 km SRH20

0–3 km SRH-27

Eff. SRH-27

Storm Motion229° @ 22 kt

0–1 km EHI0.2

Composite Parameters

Sig. Tornado0.1

STP (eff)0.0

Supercell0.0

K-Index33.9

Thermo & Levels

PWAT1.71 in

0–3 km LR5.9 °C/km

700–500 LR6.7 °C/km

Total Totals47.7

LCL919 hPa

LFC899 hPa

EL208 hPa

Freezing Lvl13,451 ft

St. Clair County, Missouri, United States

Alerts