Heat Advisory — Inland Flagler, FL, Coastal Duval, FL, Eastern Clay, FL, Eastern Putnam, FL, Coastal Flagler, FL, Western Clay, FL, Northeast Coastal St. Johns, FL, Western Putnam, FL, South Central Duval, FL, Southeast Coastal St. Johns, FL, Northern Inland St. Johns, FL, Southern Inland St. Johns, FL, Western St. Johns, FL 6:00 PM 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 Bay, FL, Calhoun, FL, Inland Gulf, FL, Inland Franklin, FL, Gadsden, FL, Leon, FL, Inland Jefferson, FL, Madison, FL, Inland Wakulla, FL, Inland Taylor, FL, Lafayette, FL, Inland Dixie, FL, South Walton, FL, Coastal Bay, FL, Coastal Gulf, FL, Coastal Franklin, FL, Coastal Jefferson, FL, Coastal Wakulla, FL, Coastal Taylor, FL, Coastal Dixie, FL, Northern Liberty, FL, Southern Liberty, FL, Seminole, GA, Decatur, GA, Grady, GA, Thomas, GA, Brooks, GA, Lowndes, GA, Lanier, GA 7:00 PM

Saint Augustine, Florida

Last updated: 11:32 PM CDT  ·  Refresh
24°C
Feels like 28°
Mostly Cloudy
▲ 35°  /  ▼ 24°
Wind
4 mph SW
Humidity
86%
Dew Point
23°
Pressure
30.00 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
79%
Sunrise
6:56 AM
Sunset
7:59 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Augustine is currently mostly cloudy at 25°C. Precipitation is likely — peak probability 63% around 4 PM. Atmospheric instability is elevated (CAPE up to 2144 J/kg) — isolated convective development possible. Sunrise: 6:56AM · Sunset: 7:59PM.

Alerts

Heat Advisory
Inland Flagler, FL, Coastal Duval, FL, Eastern Clay, FL, Eastern Putnam, FL, Coastal Flagler, FL, Western Clay, FL, Northeast Coastal St. Johns, FL, Western Putnam, FL, South Central Duval, FL, Southeast Coastal St. Johns, FL, Northern Inland St. Johns, FL, Southern Inland St. Johns, FL, Western St. Johns, FL
Expires 6:00 PM
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 Bay, FL, Calhoun, FL, Inland Gulf, FL, Inland Franklin, FL, Gadsden, FL, Leon, FL, Inland Jefferson, FL, Madison, FL, Inland Wakulla, FL, Inland Taylor, FL, Lafayette, FL, Inland Dixie, FL, South Walton, FL, Coastal Bay, FL, Coastal Gulf, FL, Coastal Franklin, FL, Coastal Jefferson, FL, Coastal Wakulla, FL, Coastal Taylor, FL, Coastal Dixie, FL, Northern Liberty, FL, Southern Liberty, FL, Seminole, GA, Decatur, GA, Grady, GA, Thomas, GA, Brooks, GA, Lowndes, GA, Lanier, GA
Expires 7:00 PM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
32%
1 AM
25°
27%
2 AM
25°
15%
3 AM
24°
15%
4 AM
25°
15%
5 AM
23°
7%
6 AM
23°
12%
7 AM
24°
12%
8 AM
24°
29%
9 AM
27°
17%
10 AM
29°
21%
11 AM
30°
48%
12 PM
31°
57%
1 PM
33°
51%
2 PM
33°
58%
3 PM
32°
62%
4 PM
32°
62%
5 PM
30°
54%
6 PM
29°
54%
7 PM
28°
51%
8 PM
28°
28%
9 PM
28°
28%
10 PM
28°
31%
11 PM
27°
20%
7-Day Forecast
Today
35° 24°
Partly Cloudy with a 62% chance of rain.
Sat
36° 24°
Partly Cloudy with a 42% chance of rain.
Sun
36° 24°
Partly Cloudy with a 72% chance of rain.
Mon
34° 24°
Drizzle, 50% chance.
Tue
34° 25°
Heavy Rain, 82% chance.
Wed
34° 26°
Rain, 70% chance.
Thu
34° 25°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Mostly Cloudy 32% 4 mph SW 86%
1 AM 25° Overcast 27% 5 mph SW 86%
2 AM 25° Overcast 15% 5 mph SW 86%
3 AM 24° Mostly Cloudy 15% 4 mph WSW 86%
4 AM 25° Partly Cloudy 15% 4 mph WSW 87%
5 AM 23° Mostly Clear 7% 3 mph WSW 86%
6 AM 23° Mostly Clear 12% 3 mph SW 86%
7 AM 24° Mostly Clear 12% 3 mph SSW 85%
8 AM 24° Partly Cloudy 29% 3 mph SSW 82%
9 AM 27° Partly Cloudy 17% 3 mph SSW 76%
10 AM 29° Mostly Clear 21% 4 mph S 70%
11 AM 30° Partly Cloudy 48% 4 mph S 66%
12 PM 31° Partly Cloudy 57% 5 mph SSE 64%
1 PM 33° Partly Cloudy 51% 6 mph SSE 62%
2 PM 33° Partly Cloudy 58% 7 mph SE 63%
3 PM 32° Mostly Cloudy 62% 8 mph SE 66%
4 PM 32° Mostly Cloudy 62% 9 mph SE 70%
5 PM 30° Mostly Cloudy 54% 9 mph SE 72%
6 PM 29° Mostly Cloudy 54% 9 mph SE 74%
7 PM 28° Mostly Cloudy 51% 9 mph SE 76%
8 PM 28° Mostly Cloudy 28% 8 mph SSE 77%
9 PM 28° Mostly Cloudy 28% 7 mph SSE 77%
10 PM 28° Partly Cloudy 31% 7 mph S 78%
11 PM 27° Partly Cloudy 20% 7 mph SSW 78%
15-Day Forecast
Today
8/21
Partly Cloudy
62%
24°
35°
Sat
8/22
Partly Cloudy
42%
24°
36°
Sun
8/23
Partly Cloudy
72%
24°
36°
Mon
8/24
Drizzle
50%
24°
34°
Tue
8/25
Heavy Rain
82%
25°
34°
Wed
8/26
Rain
70%
26°
34°
Thu
8/27
Rain
63%
25°
34°
Fri
8/28
Rain
68%
24°
34°
Sat
8/29
Drizzle
44%
25°
34°
Sun
8/30
Rain
64%
24°
33°
Mon
8/31
Drizzle
60%
26°
34°
Tue
9/1
Drizzle
60%
26°
34°
Wed
9/2
Drizzle
60%
26°
33°
Thu
9/3
Drizzle
60%
26°
33°
Fri
9/4
Drizzle
60%
26°
33°
51
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
51 AQI 9.1 µg/m³
O3
Ground-level ozone
47 AQI 52 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 47 51
Sat 52 Moderate 44 52
Sun 47 Good 33 47
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 Aug 21, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE712 J/kg
MLCAPE159 J/kg
MUCAPE712 J/kg
SBCIN-268 J/kg
MLCIN-276 J/kg
Lifted Index-3.4
Kinematics
0–6 km Shear5 kt
0–1 km Shear3 kt
Eff. Shear—
0–1 km SRH7
0–3 km SRH48
Eff. SRH—
Storm Motion220° @ 23 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index34.6
Thermo & Levels
PWAT1.98 in
0–3 km LR5.0 °C/km
700–500 LR5.7 °C/km
Total Totals45.3
LCL988 hPa
LFC758 hPa
EL240 hPa
Freezing Lvl14,357 ft