Extreme Heat Warning — 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 7:00 PM Extreme Heat Warning — 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, Inland Glynn, GA, Coastal Glynn, GA, Echols, GA, Inland Camden, GA, Coastal Camden, GA 7:00 PM

Saint Augustine, Florida

Last updated: 9:41 AM CDT  ·  Refresh
31°C
Feels like 36°
Clear
▲ 37°  /  ▼ 26°
Wind
8 mph W
Humidity
65%
Dew Point
25°
Pressure
29.97 inHg
Visibility
8 mi
UV Index
8.2
Cloud Cover
3%
Sunrise
6:54 AM
Sunset
8:03 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Augustine is currently clear at 31°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2744 J/kg) — isolated convective development possible. Sunrise: 6:54AM · Sunset: 8:03PM.

Alerts

Extreme Heat Warning
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
Expires 7:00 PM
Extreme Heat Warning
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, Inland Glynn, GA, Coastal Glynn, GA, Echols, GA, Inland Camden, GA, Coastal Camden, GA
Expires 7:00 PM
56 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
9%
11 AM
33°
23%
12 PM
34°
28%
1 PM
36°
32%
2 PM
36°
32%
3 PM
35°
29%
4 PM
34°
29%
5 PM
33°
34%
6 PM
32°
38%
7 PM
31°
32%
8 PM
31°
21%
9 PM
29°
21%
10 PM
28°
22%
11 PM
28°
22%
12 AM
28°
23%
1 AM
27°
14%
2 AM
27°
9%
3 AM
27°
14%
4 AM
27°
15%
5 AM
26°
15%
6 AM
26°
21%
7 AM
27°
21%
8 AM
27°
24%
9 AM
31°
34%
7-Day Forecast
Today
37° 26°
Mostly Clear with a 32% chance of rain.
Wed
38° 26°
Mostly Clear with a 63% chance of rain.
Thu
37° 26°
Rain, 59% chance.
Fri
34° 26°
Rain, 82% chance.
Sat
34° 25°
Drizzle, 58% chance.
Sun
34° 25°
Drizzle, 52% chance.
Mon
33° 24°
Rain, 41% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Clear 9% 8 mph W 65%
11 AM 33° Clear 23% 8 mph W 59%
12 PM 34° Mostly Clear 28% 7 mph W 56%
1 PM 36° Mostly Clear 32% 7 mph W 52%
2 PM 36° Mostly Clear 32% 5 mph W 54%
3 PM 35° Partly Cloudy 29% 6 mph WSW 57%
4 PM 34° Partly Cloudy 29% 8 mph SSW 62%
5 PM 33° Partly Cloudy 34% 7 mph SSW 65%
6 PM 32° Partly Cloudy 38% 6 mph SW 70%
7 PM 31° Partly Cloudy 32% 7 mph SW 76%
8 PM 31° Partly Cloudy 21% 8 mph WSW 78%
9 PM 29° Partly Cloudy 21% 8 mph WSW 80%
10 PM 28° Partly Cloudy 22% 9 mph W 81%
11 PM 28° Partly Cloudy 22% 9 mph W 81%
12 AM 28° Partly Cloudy 23% 9 mph WSW 81%
1 AM 27° Partly Cloudy 14% 8 mph WSW 81%
2 AM 27° Partly Cloudy 9% 8 mph WSW 83%
3 AM 27° Partly Cloudy 14% 8 mph WSW 84%
4 AM 27° Partly Cloudy 15% 8 mph WSW 85%
5 AM 26° Mostly Clear 15% 8 mph W 85%
6 AM 26° Mostly Clear 21% 7 mph W 85%
7 AM 27° Clear 21% 7 mph W 85%
8 AM 27° Clear 24% 6 mph W 80%
9 AM 31° Clear 34% 5 mph W 72%
15-Day Forecast
Today
8/18
Mostly Clear
32%
26°
37°
Wed
8/19
Mostly Clear
63%
26°
38°
Thu
8/20
Rain
59%
26°
37°
Fri
8/21
Rain
82%
26°
34°
Sat
8/22
Drizzle
58%
25°
34°
Sun
8/23
Drizzle
52%
25°
34°
Mon
8/24
Rain
41%
24°
33°
Tue
8/25
Rain
69%
25°
34°
Wed
8/26
Drizzle
68%
25°
34°
Thu
8/27
Drizzle
68%
24°
31°
Fri
8/28
Drizzle
68%
23°
33°
Sat
8/29
Drizzle
60%
25°
32°
Sun
8/30
Drizzle
60%
25°
32°
Mon
8/31
Drizzle
60%
25°
32°
Tue
9/1
Drizzle
60%
25°
32°
56
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
56 AQI 11.7 µg/m³
O3
Ground-level ozone
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 56 Moderate 34 56
Thu 54 Moderate 42 54
Fri 52 Moderate 46 52
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 Aug 18, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3098 J/kg
MLCAPE922 J/kg
MUCAPE3098 J/kg
SBCIN-50 J/kg
MLCIN-118 J/kg
Lifted Index-6.8
Kinematics
0–6 km Shear7 kt
0–1 km Shear11 kt
Eff. Shear8 kt
0–1 km SRH17
0–3 km SRH17
Eff. SRH17
Storm Motion178° @ 7 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.3
Thermo & Levels
PWAT1.88 in
0–3 km LR6.5 °C/km
700–500 LR6.0 °C/km
Total Totals45.6
LCL928 hPa
LFC849 hPa
EL135 hPa
Freezing Lvl16,588 ft