Heat Advisory — Coffee, AL, Dale, AL, Henry, AL, Geneva, AL, Houston, AL, North Walton, FL, Central Walton, FL, Holmes, FL, Washington, FL, Jackson, FL, Inland Jefferson, FL, Madison, FL, Inland Taylor, FL, Lafayette, FL, Inland Dixie, FL, Coastal Taylor, FL, Coastal Dixie, FL, Quitman, GA, Clay, GA, Randolph, GA, Calhoun, GA, Terrell, GA, Dougherty, GA, Lee, GA, Worth, GA, Turner, GA, Tift, GA, Ben Hill, GA, Irwin, GA, Early, GA, Miller, GA, Baker, GA, Mitchell, GA, Colquitt, GA, Cook, GA, Berrien, GA, Seminole, GA, Decatur, GA, Grady, GA, Thomas, GA, Brooks, GA, Lowndes, GA, Lanier, GA 7:00 PM Heat Advisory — Suwannee, FL, Baker, FL, Inland Nassau, FL, Union, FL, Bradford, FL, Gilchrist, FL, Inland Flagler, FL, Eastern Hamilton, FL, Coastal Nassau, FL, Coastal Duval, FL, Eastern Clay, FL, Eastern Alachua, FL, Eastern Putnam, FL, Coastal Flagler, FL, Eastern Marion, FL, Western Hamilton, FL, Trout River, FL, Western Clay, FL, Northeast Coastal St. Johns, FL, Western Alachua, FL, Western Putnam, FL, Central Marion, FL, Northern Columbia, FL, South Central Duval, FL, Southeast Coastal St. Johns, FL, Western Marion, FL, Southeastern Columbia, FL, Western Duval, FL, Northern Inland St. Johns, FL, Southwestern Columbia, FL, Southern Inland St. Johns, FL, Western St. Johns, FL, Coffee, GA, Jeff Davis, GA, Bacon, GA, Appling, GA, Wayne, GA, Atkinson, GA, Pierce, GA, Brantley, GA, Echols, GA, Clinch, GA, Northern Ware, GA, Northeastern Charlton, GA, Southern Ware, GA, Western Charlton, GA 7:00 PM

Saint Augustine, Florida

Last updated: 9:57 AM CDT  ·  Refresh
31°C
Feels like 36°
Mostly Clear
▲ 36°  /  ▼ 27°
Wind
7 mph W
Humidity
64%
Dew Point
25°
Pressure
30.03 inHg
Visibility
10 mi
UV Index
8.3
Cloud Cover
29%
Sunrise
6:54 AM
Sunset
8:04 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Augustine is currently mostly clear at 31°C. Precipitation is likely — peak probability 51% around 3 PM. Atmospheric instability is elevated (CAPE up to 2882 J/kg) — isolated convective development possible. Sunrise: 6:54AM · Sunset: 8:04PM.

Alerts

Heat Advisory
Coffee, AL, Dale, AL, Henry, AL, Geneva, AL, Houston, AL, North Walton, FL, Central Walton, FL, Holmes, FL, Washington, FL, Jackson, FL, Inland Jefferson, FL, Madison, FL, Inland Taylor, FL, Lafayette, FL, Inland Dixie, FL, Coastal Taylor, FL, Coastal Dixie, FL, Quitman, GA, Clay, GA, Randolph, GA, Calhoun, GA, Terrell, GA, Dougherty, GA, Lee, GA, Worth, GA, Turner, GA, Tift, GA, Ben Hill, GA, Irwin, GA, Early, GA, Miller, GA, Baker, GA, Mitchell, GA, Colquitt, GA, Cook, GA, Berrien, GA, Seminole, GA, Decatur, GA, Grady, GA, Thomas, GA, Brooks, GA, Lowndes, GA, Lanier, GA
Expires 7:00 PM
Heat Advisory
Suwannee, FL, Baker, FL, Inland Nassau, FL, Union, FL, Bradford, FL, Gilchrist, FL, Inland Flagler, FL, Eastern Hamilton, FL, Coastal Nassau, FL, Coastal Duval, FL, Eastern Clay, FL, Eastern Alachua, FL, Eastern Putnam, FL, Coastal Flagler, FL, Eastern Marion, FL, Western Hamilton, FL, Trout River, FL, Western Clay, FL, Northeast Coastal St. Johns, FL, Western Alachua, FL, Western Putnam, FL, Central Marion, FL, Northern Columbia, FL, South Central Duval, FL, Southeast Coastal St. Johns, FL, Western Marion, FL, Southeastern Columbia, FL, Western Duval, FL, Northern Inland St. Johns, FL, Southwestern Columbia, FL, Southern Inland St. Johns, FL, Western St. Johns, FL, Coffee, GA, Jeff Davis, GA, Bacon, GA, Appling, GA, Wayne, GA, Atkinson, GA, Pierce, GA, Brantley, GA, Echols, GA, Clinch, GA, Northern Ware, GA, Northeastern Charlton, GA, Southern Ware, GA, Western Charlton, GA
Expires 7:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
26%
11 AM
33°
41%
12 PM
33°
42%
1 PM
36°
43%
2 PM
36°
47%
3 PM
36°
51%
4 PM
36°
42%
5 PM
35°
39%
6 PM
34°
28%
7 PM
32°
20%
8 PM
31°
27%
9 PM
29°
27%
10 PM
28°
16%
11 PM
28°
17%
12 AM
28°
18%
1 AM
28°
18%
2 AM
28°
18%
3 AM
27°
24%
4 AM
27°
24%
5 AM
27°
24%
6 AM
27°
22%
7 AM
27°
22%
8 AM
28°
35%
9 AM
31°
44%
7-Day Forecast
Today
36° 27°
Partly Cloudy with a 43% chance of rain.
Tue
38° 26°
Partly Cloudy with a 73% chance of rain.
Wed
38° 26°
Mostly Cloudy with a 59% chance of rain.
Thu
36° 25°
Mostly Clear with a 82% chance of rain.
Fri
36° 25°
Rain, 64% chance.
Sat
33° 25°
Rain, 64% chance.
Sun
34° 24°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Clear 26% 7 mph W 64%
11 AM 33° Partly Cloudy 41% 7 mph W 60%
12 PM 33° Partly Cloudy 42% 6 mph W 57%
1 PM 36° Partly Cloudy 43% 5 mph WSW 54%
2 PM 36° Mostly Cloudy 47% 6 mph WSW 53%
3 PM 36° Partly Cloudy 51% 6 mph WSW 54%
4 PM 36° Partly Cloudy 42% 7 mph SW 56%
5 PM 35° Partly Cloudy 39% 6 mph SW 61%
6 PM 34° Partly Cloudy 28% 6 mph S 67%
7 PM 32° Partly Cloudy 20% 7 mph S 74%
8 PM 31° Partly Cloudy 27% 7 mph SSW 78%
9 PM 29° Mostly Cloudy 27% 8 mph SW 80%
10 PM 28° Partly Cloudy 16% 10 mph WSW 82%
11 PM 28° Partly Cloudy 17% 9 mph WSW 83%
12 AM 28° Mostly Cloudy 18% 9 mph WSW 84%
1 AM 28° Mostly Cloudy 18% 9 mph WSW 85%
2 AM 28° Partly Cloudy 18% 9 mph WSW 86%
3 AM 27° Rain 24% 9 mph WSW 86%
4 AM 27° Rain 24% 9 mph WSW 86%
5 AM 27° Rain 24% 8 mph WSW 86%
6 AM 27° Rain 22% 8 mph WSW 86%
7 AM 27° Rain 22% 8 mph WSW 86%
8 AM 28° Mostly Clear 35% 8 mph WSW 80%
9 AM 31° Mostly Clear 44% 8 mph WSW 75%
15-Day Forecast
Today
8/17
Partly Cloudy
43%
27°
36°
Tue
8/18
Partly Cloudy
73%
26°
38°
Wed
8/19
Mostly Cloudy
59%
26°
38°
Thu
8/20
Mostly Clear
82%
25°
36°
Fri
8/21
Rain
64%
25°
36°
Sat
8/22
Rain
64%
25°
33°
Sun
8/23
Rain
63%
24°
34°
Mon
8/24
Rain
69%
24°
34°
Tue
8/25
Rain
68%
25°
34°
Wed
8/26
Drizzle
60%
26°
34°
Thu
8/27
Drizzle
60%
26°
34°
Fri
8/28
Drizzle
60%
26°
33°
Sat
8/29
Drizzle
60%
26°
33°
Sun
8/30
Drizzle
60%
25°
33°
Mon
8/31
Drizzle
60%
25°
33°
52
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
52 AQI 9.8 µg/m³
O3
Ground-level ozone
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 52 Moderate 32 52
Wed 52 Moderate 34 52
Thu 50 Good 42 50
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, 13:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3330 J/kg
MLCAPE2460 J/kg
MUCAPE3460 J/kg
SBCIN-18 J/kg
MLCIN-30 J/kg
Lifted Index-6.6
Kinematics
0–6 km Shear7 kt
0–1 km Shear8 kt
Eff. Shear14 kt
0–1 km SRH-24
0–3 km SRH-2
Eff. SRH-2
Storm Motion219° @ 17 kt
0–1 km EHI-0.5
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.0
Thermo & Levels
PWAT2.30 in
0–3 km LR6.6 °C/km
700–500 LR5.6 °C/km
Total Totals46.1
LCL932 hPa
LFC888 hPa
EL127 hPa
Freezing Lvl16,132 ft