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, Echols, GA 7:00 PM Excessive 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, Echols, GA 7:00 PM

Saint Augustine Beach, Florida

Last updated: 12:43 PM CDT  ·  Refresh
33°C
Feels like 42°
Mostly Clear
▲ 36°  /  ▼ 27°
Wind
7 mph W
Humidity
65%
Dew Point
25°
Pressure
30.01 inHg
Visibility
10 mi
UV Index
9.5
Cloud Cover
30%
Sunrise
6:53 AM
Sunset
8:03 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Augustine Beach is currently mostly clear at 33°C. Precipitation is likely — peak probability 51% around 1 PM. Atmospheric instability is elevated (CAPE up to 3102 J/kg) — isolated convective development possible. Sunrise: 6:53AM · Sunset: 8:03PM.

Alerts

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, Echols, GA
Expires 7:00 PM
Excessive 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, Echols, GA
Expires 7:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
32%
2 PM
34°
26%
3 PM
34°
12%
4 PM
34°
13%
5 PM
34°
24%
6 PM
32°
26%
7 PM
32°
34%
8 PM
31°
34%
9 PM
29°
21%
10 PM
29°
21%
11 PM
29°
21%
12 AM
28°
21%
1 AM
28°
13%
2 AM
28°
10%
3 AM
28°
10%
4 AM
28°
10%
5 AM
27°
20%
6 AM
27°
18%
7 AM
27°
18%
8 AM
27°
21%
9 AM
30°
25%
10 AM
31°
34%
11 AM
32°
45%
12 PM
32°
45%
7-Day Forecast
Today
36° 27°
Partly Cloudy with a 34% chance of rain.
Tue
37° 27°
Rain, 85% chance.
Wed
36° 25°
Mostly Cloudy with a 64% chance of rain.
Thu
34° 24°
Partly Cloudy with a 83% chance of rain.
Fri
35° 25°
Rain, 82% chance.
Sat
33° 26°
Rain, 82% chance.
Sun
33° 24°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 32% 7 mph W 65%
2 PM 34° Mostly Clear 26% 5 mph SW 64%
3 PM 34° Mostly Clear 12% 5 mph SSW 64%
4 PM 34° Partly Cloudy 13% 6 mph S 63%
5 PM 34° Mostly Cloudy 24% 7 mph SSE 66%
6 PM 32° Rain 26% 8 mph S 71%
7 PM 32° Thunderstorm 34% 7 mph SSE 76%
8 PM 31° Rain 34% 7 mph S 78%
9 PM 29° Partly Cloudy 21% 7 mph SSW 79%
10 PM 29° Mostly Clear 21% 8 mph SW 80%
11 PM 29° Mostly Clear 21% 9 mph WSW 81%
12 AM 28° Partly Cloudy 21% 9 mph WSW 81%
1 AM 28° Partly Cloudy 13% 10 mph WSW 82%
2 AM 28° Partly Cloudy 10% 10 mph WSW 82%
3 AM 28° Partly Cloudy 10% 10 mph WSW 82%
4 AM 28° Partly Cloudy 10% 10 mph WSW 83%
5 AM 27° Mostly Clear 20% 10 mph WSW 83%
6 AM 27° Mostly Clear 18% 10 mph WSW 84%
7 AM 27° Mostly Clear 18% 9 mph WSW 84%
8 AM 27° Mostly Clear 21% 9 mph WSW 81%
9 AM 30° Mostly Clear 25% 9 mph W 76%
10 AM 31° Mostly Clear 34% 8 mph W 71%
11 AM 32° Mostly Clear 45% 8 mph W 68%
12 PM 32° Mostly Clear 45% 7 mph WSW 66%
15-Day Forecast
Today
8/17
Partly Cloudy
34%
27°
36°
Tue
8/18
Rain
85%
27°
37°
Wed
8/19
Mostly Cloudy
64%
25°
36°
Thu
8/20
Partly Cloudy
83%
24°
34°
Fri
8/21
Rain
82%
25°
35°
Sat
8/22
Rain
82%
26°
33°
Sun
8/23
Rain
63%
24°
33°
Mon
8/24
Rain
69%
24°
34°
Tue
8/25
Thunderstorm
68%
25°
34°
Wed
8/26
Drizzle
68%
26°
34°
Thu
8/27
Drizzle
60%
26°
34°
Fri
8/28
Rain
90%
26°
33°
Sat
8/29
Drizzle
60%
26°
33°
Sun
8/30
Drizzle
60%
26°
32°
Mon
8/31
Drizzle
60%
26°
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 10.0 µg/m³
O3
Ground-level ozone
34 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 52 Moderate 34 52
Wed 52 Moderate 35 52
Thu 51 Moderate 43 51
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, 16:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3439 J/kg
MLCAPE3704 J/kg
MUCAPE4434 J/kg
SBCIN-17 J/kg
MLCIN-9 J/kg
Lifted Index-6.9
Kinematics
0–6 km Shear0 kt
0–1 km Shear6 kt
Eff. Shear12 kt
0–1 km SRH13
0–3 km SRH40
Eff. SRH40
Storm Motion45° @ 7 kt
0–1 km EHI0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.0
Thermo & Levels
PWAT2.43 in
0–3 km LR7.3 °C/km
700–500 LR5.6 °C/km
Total Totals47.6
LCL898 hPa
LFC875 hPa
EL126 hPa
Freezing Lvl16,640 ft