Extreme Heat Warning — Marion, AL, Lamar, AL, Fayette, AL, Winston, AL, Walker, AL, Blount, AL, Etowah, AL, Calhoun, AL, Cherokee, AL, Cleburne, AL, Pickens, AL, Tuscaloosa, AL, Jefferson, AL, Shelby, AL, St. Clair, AL, Talladega, AL, Clay, AL, Randolph, AL, Sumter, AL, Greene, AL, Hale, AL, Perry, AL, Bibb, AL, Chilton, AL, Coosa, AL, Tallapoosa, AL, Chambers, AL, Marengo, AL, Dallas, AL, Autauga, AL, Lowndes, AL, Elmore, AL, Montgomery, AL, Macon, AL, Bullock, AL, Lee, AL, Russell, AL, Pike, AL, Barbour, AL 9:00 PM

St. Clair County, Alabama, United States

Last updated: 2:24 AM CDT  ·  Refresh
26°C
Feels like 29°
Clear
▲ 37°  /  ▼ 22°
Wind
3 mph SSW
Humidity
82%
Dew Point
23°
Pressure
29.27 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
7%
Sunrise
6:08 AM
Sunset
7:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: St. Clair County is currently clear at 26°C. Precipitation is likely — peak probability 53% around 9 PM. Atmospheric instability is elevated (CAPE up to 1906 J/kg) — isolated convective development possible. Sunrise: 6:08AM · Sunset: 7:29PM.

Alerts

Extreme Heat Warning
Marion, AL, Lamar, AL, Fayette, AL, Winston, AL, Walker, AL, Blount, AL, Etowah, AL, Calhoun, AL, Cherokee, AL, Cleburne, AL, Pickens, AL, Tuscaloosa, AL, Jefferson, AL, Shelby, AL, St. Clair, AL, Talladega, AL, Clay, AL, Randolph, AL, Sumter, AL, Greene, AL, Hale, AL, Perry, AL, Bibb, AL, Chilton, AL, Coosa, AL, Tallapoosa, AL, Chambers, AL, Marengo, AL, Dallas, AL, Autauga, AL, Lowndes, AL, Elmore, AL, Montgomery, AL, Macon, AL, Bullock, AL, Lee, AL, Russell, AL, Pike, AL, Barbour, AL
Expires 9:00 PM
55 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
3%
3 AM
25°
3%
4 AM
25°
3%
5 AM
23°
3%
6 AM
23°
3%
7 AM
24°
7%
8 AM
27°
15%
9 AM
30°
15%
10 AM
32°
15%
11 AM
33°
15%
12 PM
34°
16%
1 PM
37°
21%
2 PM
37°
25%
3 PM
37°
31%
4 PM
37°
40%
5 PM
35°
45%
6 PM
33°
48%
7 PM
31°
49%
8 PM
31°
49%
9 PM
28°
52%
10 PM
27°
38%
11 PM
27°
38%
12 AM
27°
28%
1 AM
27°
22%
7-Day Forecast
Today
37° 22°
Mostly Clear with a 49% chance of rain.
Tue
35° 22°
Haze.
Wed
37° 19°
Clear.
Thu
33° 22°
Mostly Clear with a 39% chance of rain.
Fri
32° 21°
Drizzle, 51% chance.
Sat
33° 20°
Rain, 42% chance.
Sun
34° 20°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 3% 3 mph SSW 82%
3 AM 25° Mostly Clear 3% 4 mph SW 81%
4 AM 25° Mostly Clear 3% 4 mph SW 83%
5 AM 23° Mostly Clear 3% 4 mph SW 84%
6 AM 23° Mostly Clear 3% 4 mph SW 85%
7 AM 24° Mostly Clear 7% 4 mph WSW 81%
8 AM 27° Mostly Clear 15% 5 mph WSW 72%
9 AM 30° Mostly Clear 15% 6 mph W 64%
10 AM 32° Mostly Clear 15% 7 mph W 56%
11 AM 33° Mostly Clear 15% 7 mph W 51%
12 PM 34° Mostly Clear 16% 7 mph W 46%
1 PM 37° Mostly Clear 21% 7 mph W 42%
2 PM 37° Mostly Clear 25% 7 mph W 41%
3 PM 37° Mostly Clear 31% 7 mph W 40%
4 PM 37° Mostly Clear 40% 6 mph W 42%
5 PM 35° Partly Cloudy 45% 6 mph WNW 49%
6 PM 33° Rain 48% 7 mph WNW 56%
7 PM 31° Rain 49% 6 mph WNW 63%
8 PM 31° Mostly Cloudy 49% 5 mph W 69%
9 PM 28° Partly Cloudy 52% 5 mph SW 75%
10 PM 27° Partly Cloudy 38% 5 mph SW 78%
11 PM 27° Partly Cloudy 38% 5 mph WSW 79%
12 AM 27° Mostly Cloudy 28% 6 mph W 80%
1 AM 27° Mostly Cloudy 22% 6 mph W 82%
15-Day Forecast
Today
8/17
Mostly Clear
49%
22°
37°
Tue
8/18
Haze
19%
22°
35°
Wed
8/19
Clear
14%
19°
37°
Thu
8/20
Mostly Clear
39%
22°
33°
Fri
8/21
Drizzle
51%
21°
32°
Sat
8/22
Rain
42%
20°
33°
Sun
8/23
Clear
8%
20°
34°
Mon
8/24
Rain
44%
19°
33°
Tue
8/25
Rain
68%
20°
33°
Wed
8/26
Rain
64%
20°
32°
Thu
8/27
Drizzle
60%
21°
33°
Fri
8/28
Drizzle
60%
21°
32°
Sat
8/29
Drizzle
60%
20°
32°
Sun
8/30
Drizzle
60%
20°
32°
Mon
8/31
Drizzle
60%
20°
31°
55
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
55 AQI 11.5 µg/m³
O3
Ground-level ozone
26 AQI 29 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 55 Moderate 26 55
Tue 56 Moderate 33 56
Wed 56 Moderate 35 56
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 Mon Aug 17, 06:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE782 J/kg
MLCAPE623 J/kg
MUCAPE1007 J/kg
SBCIN-226 J/kg
MLCIN-104 J/kg
Lifted Index-2.5
Kinematics
0–6 km Shear5 kt
0–1 km Shear10 kt
Eff. Shear4 kt
0–1 km SRH43
0–3 km SRH88
Eff. SRH88
Storm Motion42° @ 12 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index21.4
Thermo & Levels
PWAT1.63 in
0–3 km LR4.9 °C/km
700–500 LR5.6 °C/km
Total Totals46.7
LCL954 hPa
LFC776 hPa
EL192 hPa
Freezing Lvl16,316 ft