Freeze Warning — Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Madison, IL, St. Clair, IL, Monroe, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 8:00 AM

Saint Clair County, Illinois, United States

Last updated: 2:10 PM CDT  ·  Refresh
12°C
Feels like 7°
Mostly Cloudy
▲ 12°  /  ▼ 1°
Wind
10 mph NNW
Humidity
65%
Dew Point
5°
Pressure
29.61 inHg
Visibility
10 mi
UV Index
4.1
Cloud Cover
72%
Sunrise
6:30 AM
Sunset
4:54 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Clair County is currently mostly cloudy at 11°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:30AM · Sunset: 4:54PM.

Alerts

Freeze Warning
Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Madison, IL, St. Clair, IL, Monroe, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 8:00 AM
26 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
12°
0%
3 PM
12°
0%
4 PM
12°
0%
5 PM
11°
0%
6 PM
9°
0%
7 PM
8°
0%
8 PM
7°
0%
9 PM
6°
0%
10 PM
5°
0%
11 PM
4°
0%
12 AM
4°
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°
Mostly Cloudy.
Sat
13° 1°
Partly Cloudy.
Sun
18° 3°
Mostly Clear.
Mon
20° 8°
Clear.
Tue
19° 8°
Clear.
Wed
17° 6°
Partly Cloudy with a 40% chance of rain.
Thu
13° 3°
Overcast with a 36% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 12° Mostly Cloudy 0% 10 mph NNW 65%
3 PM 12° Mostly Cloudy 0% 10 mph NNW 64%
4 PM 12° Mostly Cloudy 0% 9 mph NNW 63%
5 PM 11° Partly Cloudy 0% 8 mph NNW 66%
6 PM 9° Partly Cloudy 0% 8 mph N 72%
7 PM 8° Partly Cloudy 0% 7 mph N 73%
8 PM 7° Mostly Clear 0% 6 mph N 75%
9 PM 6° Mostly Clear 0% 5 mph N 78%
10 PM 5° Clear 0% 5 mph NNW 80%
11 PM 4° Clear 0% 4 mph NNW 83%
12 AM 4° Clear 0% 4 mph NNW 85%
1 AM 3° Clear 0% 4 mph NNW 86%
2 AM 3° Clear 0% 4 mph NNW 88%
3 AM 2° Clear 0% 4 mph NNW 89%
4 AM 2° Clear 0% 3 mph NNW 90%
5 AM 1° Mostly Clear 0% 3 mph NW 90%
6 AM 1° Mostly Clear 0% 3 mph NNW 90%
7 AM 2° Mostly Clear 0% 3 mph NNW 89%
8 AM 2° Mostly Clear 0% 4 mph NNW 86%
9 AM 4° Mostly Clear 0% 4 mph NNW 79%
10 AM 6° Partly Cloudy 0% 4 mph NNW 70%
11 AM 7° Partly Cloudy 0% 5 mph NNW 64%
12 PM 9° Partly Cloudy 0% 5 mph NW 61%
1 PM 10° Partly Cloudy 0% 4 mph NW 59%
15-Day Forecast
Today
11/6
Mostly Cloudy
0%
1°
12°
Sat
11/7
Partly Cloudy
0%
1°
13°
Sun
11/8
Mostly Clear
3%
3°
18°
Mon
11/9
Clear
3%
8°
20°
Tue
11/10
Clear
3%
8°
19°
Wed
11/11
Partly Cloudy
40%
6°
17°
Thu
11/12
Overcast
36%
3°
13°
Fri
11/13
Mostly Cloudy
14%
0°
9°
Sat
11/14
Mostly Clear
24%
-2°
10°
Sun
11/15
Mostly Cloudy
49%
-2°
13°
Mon
11/16
Overcast
86%
3°
15°
Tue
11/17
Drizzle
81%
8°
15°
Wed
11/18
Drizzle
81%
8°
14°
Thu
11/19
Drizzle
70%
7°
13°
Fri
11/20
Drizzle
74%
7°
13°
26
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
16 AQI 2.9 µg/m³
O3
Ground-level ozone
Dominant
26 AQI 29 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 26 Good 26 16
Sun 51 Moderate 20 51
Mon 53 Moderate 25 53
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
MLCAPE17 J/kg
MUCAPE0 J/kg
SBCIN0 J/kg
MLCIN-0 J/kg
Lifted Index12.1
Kinematics
0–6 km Shear16 kt
0–1 km Shear7 kt
Eff. Shear—
0–1 km SRH22
0–3 km SRH36
Eff. SRH—
Storm Motion352° @ 29 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-21.3
Thermo & Levels
PWAT0.38 in
0–3 km LR3.0 °C/km
700–500 LR7.7 °C/km
Total Totals29.7
LCL913 hPa
LFC1003 hPa
EL846 hPa
Freezing Lvl3,599 ft