Excessive Heat Warning — Pointe Coupee, LA, West Feliciana, LA, East Feliciana, LA, St. Helena, LA, Washington, LA, Iberville, LA, West Baton Rouge, LA, East Baton Rouge, LA, Assumption, LA, St. James, LA, St. John The Baptist, LA, Upper St. Bernard, LA, Lower St. Bernard, LA, Northern Tangipahoa, LA, Southeast St. Tammany, LA, Western Orleans, LA, Eastern Orleans, LA, Northern St. Tammany, LA, Southwestern St. Tammany, LA, Central Tangipahoa, LA, Lower Tangipahoa, LA, Northern Livingston, LA, Southern Livingston, LA, Western Ascension, LA, Eastern Ascension, LA, Upper Jefferson, LA, Upper Plaquemines, LA, Central Plaquemines, LA, Lower Plaquemines, LA, Central Jefferson, LA, Coastal Jefferson, LA, Upper Lafourche, LA, Lower Lafourche, LA, Upper Terrebonne, LA, Lower Terrebonne, LA, Upper St. Charles, LA, Central St. Charles, LA, Lower St. Charles, LA, Wilkinson, MS, Amite, MS, Pike, MS, Walthall, MS, Pearl River, MS 8:00 PM Coastal Flood Advisory — St. John The Baptist, LA, Southwestern St. Tammany, LA, Lower Tangipahoa, LA, Coastal Jefferson, LA, Lower Lafourche, LA, Lower Terrebonne, LA, Upper St. Charles, LA 4:00 AM

St. John the Baptist Parish, Louisiana, United States

Last updated: 4:15 PM CDT  ·  Refresh
33°C
Feels like 42°
Partly Cloudy
▲ 34°  /  ▼ 25°
Wind
8 mph NNW
Humidity
67%
Dew Point
26°
Pressure
29.78 inHg
Visibility
9 mi
UV Index
7.7
Cloud Cover
34%
Sunrise
6:14 AM
Sunset
8:02 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: St. John the Baptist Parish is currently partly cloudy at 33°C. Precipitation is likely — peak probability 65% around 6 PM. Atmospheric instability is elevated (CAPE up to 3178 J/kg) — isolated convective development possible. Sunrise: 6:14AM · Sunset: 8:02PM.

63 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
42%
5 PM
34°
59%
6 PM
33°
65%
7 PM
32°
59%
8 PM
31°
61%
9 PM
29°
49%
10 PM
29°
35%
11 PM
29°
35%
12 AM
29°
22%
1 AM
28°
5%
2 AM
28°
5%
3 AM
28°
9%
4 AM
27°
9%
5 AM
26°
9%
6 AM
25°
9%
7 AM
26°
9%
8 AM
26°
16%
9 AM
28°
26%
10 AM
28°
27%
11 AM
30°
35%
12 PM
31°
35%
1 PM
31°
42%
2 PM
31°
46%
3 PM
31°
51%
7-Day Forecast
Today
34° 25°
Heavy Rain, 59% chance.
Wed
34° 25°
Partly Cloudy with a 70% chance of rain.
Thu
33° 25°
Partly Cloudy with a 78% chance of rain.
Fri
34° 24°
Partly Cloudy with a 52% chance of rain.
Sat
34° 24°
Drizzle, 60% chance.
Sun
34° 23°
Clear.
Mon
35° 24°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 33° Partly Cloudy 42% 8 mph NNW 67%
5 PM 34° Partly Cloudy 59% 9 mph NW 73%
6 PM 33° Partly Cloudy 65% 7 mph NW 77%
7 PM 32° Heavy Rain 59% 7 mph NW 81%
8 PM 31° Partly Cloudy 61% 8 mph NW 82%
9 PM 29° Partly Cloudy 49% 7 mph NW 82%
10 PM 29° Partly Cloudy 35% 8 mph NW 82%
11 PM 29° Mostly Clear 35% 7 mph NNW 84%
12 AM 29° Mostly Clear 22% 7 mph N 85%
1 AM 28° Mostly Clear 5% 7 mph N 86%
2 AM 28° Partly Cloudy 5% 8 mph N 84%
3 AM 28° Partly Cloudy 9% 9 mph N 83%
4 AM 27° Partly Cloudy 9% 10 mph N 83%
5 AM 26° Partly Cloudy 9% 11 mph N 83%
6 AM 25° Partly Cloudy 9% 11 mph N 84%
7 AM 26° Partly Cloudy 9% 12 mph N 84%
8 AM 26° Partly Cloudy 16% 13 mph N 82%
9 AM 28° Partly Cloudy 26% 14 mph N 80%
10 AM 28° Partly Cloudy 27% 14 mph N 77%
11 AM 30° Partly Cloudy 35% 15 mph N 74%
12 PM 31° Partly Cloudy 35% 16 mph N 72%
1 PM 31° Mostly Clear 42% 17 mph NNE 71%
2 PM 31° Partly Cloudy 46% 17 mph NNE 73%
3 PM 31° Partly Cloudy 51% 17 mph NNE 75%
15-Day Forecast
Today
7/21
Heavy Rain
59%
25°
34°
Wed
7/22
Partly Cloudy
70%
25°
34°
Thu
7/23
Partly Cloudy
78%
25°
33°
Fri
7/24
Partly Cloudy
52%
24°
34°
Sat
7/25
Drizzle
60%
24°
34°
Sun
7/26
Clear
19%
23°
34°
Mon
7/27
Clear
19%
24°
35°
Tue
7/28
Clear
9%
24°
36°
Wed
7/29
Drizzle
60%
24°
36°
Thu
7/30
Rain
90%
24°
36°
Fri
7/31
Drizzle
60%
24°
35°
Sat
8/1
Drizzle
60%
24°
35°
Sun
8/2
Drizzle
60%
24°
35°
Mon
8/3
Drizzle
60%
24°
34°
Tue
8/4
Drizzle
60%
24°
34°
63
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
63 AQI 15.8 µg/m³
O3
Ground-level ozone
26 AQI 29 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 63 Moderate 26 63
Thu 47 Good 31 47
Fri 48 Good 31 48
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 Tue Jul 21, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE4475 J/kg
MLCAPE3010 J/kg
MUCAPE4475 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-7.0
Kinematics
0–6 km Shear21 kt
0–1 km Shear10 kt
Eff. Shear31 kt
0–1 km SRH12
0–3 km SRH-47
Eff. SRH-47
Storm Motion352° @ 31 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.0
K-Index36.5
Thermo & Levels
PWAT2.37 in
0–3 km LR6.9 °C/km
700–500 LR5.4 °C/km
Total Totals45.4
LCL916 hPa
LFC1008 hPa
EL118 hPa
Freezing Lvl17,628 ft