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 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, Echols, GA 7:00 PM

Saint Augustine Beach, Florida

Last updated: 3:01 PM CDT  ·  Refresh
33°C
Feels like 43°
Mostly Clear
▲ 35°  /  ▼ 27°
Wind
6 mph SW
Humidity
66%
Dew Point
24°
Pressure
29.97 inHg
Visibility
10 mi
UV Index
8.2
Cloud Cover
29%
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 57% around 7 PM. Atmospheric instability is elevated (CAPE up to 3366 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
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, Echols, GA
Expires 7:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
31%
5 PM
33°
45%
6 PM
33°
45%
7 PM
32°
57%
8 PM
31°
42%
9 PM
31°
51%
10 PM
29°
50%
11 PM
29°
37%
12 AM
29°
34%
1 AM
29°
34%
2 AM
28°
3%
3 AM
28°
3%
4 AM
28°
3%
5 AM
28°
3%
6 AM
27°
3%
7 AM
27°
3%
8 AM
27°
3%
9 AM
27°
26%
10 AM
30°
27%
11 AM
31°
27%
12 PM
32°
28%
1 PM
32°
28%
2 PM
33°
33%
3 PM
34°
52%
7-Day Forecast
Today
35° 27°
Rain, 57% chance.
Tue
37° 27°
Mostly Clear with a 66% chance of rain.
Wed
37° 26°
Mostly Cloudy with a 65% chance of rain.
Thu
34° 25°
Partly Cloudy with a 82% chance of rain.
Fri
35° 25°
Thunderstorm, 81% chance.
Sat
34° 26°
Rain, 81% chance.
Sun
34° 25°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 31% 6 mph SW 66%
5 PM 33° Mostly Cloudy 45% 7 mph S 70%
6 PM 33° Mostly Cloudy 45% 7 mph S 74%
7 PM 32° Rain 57% 9 mph SE 77%
8 PM 31° Mostly Cloudy 42% 9 mph SSE 81%
9 PM 31° Partly Cloudy 51% 6 mph S 82%
10 PM 29° Mostly Clear 50% 6 mph SW 82%
11 PM 29° Clear 37% 8 mph WSW 83%
12 AM 29° Mostly Clear 34% 9 mph WSW 83%
1 AM 29° Partly Cloudy 34% 10 mph WSW 83%
2 AM 28° Mostly Cloudy 3% 10 mph WSW 83%
3 AM 28° Partly Cloudy 3% 10 mph WSW 83%
4 AM 28° Partly Cloudy 3% 10 mph WSW 84%
5 AM 28° Mostly Clear 3% 10 mph WSW 84%
6 AM 27° Mostly Clear 3% 10 mph WSW 85%
7 AM 27° Mostly Clear 3% 10 mph WSW 85%
8 AM 27° Mostly Clear 3% 9 mph WSW 86%
9 AM 27° Mostly Clear 26% 9 mph WSW 81%
10 AM 30° Mostly Clear 27% 9 mph W 77%
11 AM 31° Mostly Clear 27% 9 mph W 73%
12 PM 32° Mostly Clear 28% 8 mph W 71%
1 PM 32° Mostly Clear 28% 8 mph WSW 70%
2 PM 33° Mostly Clear 33% 8 mph WSW 68%
3 PM 34° Partly Cloudy 52% 7 mph SW 68%
15-Day Forecast
Today
8/17
Rain
57%
27°
35°
Tue
8/18
Mostly Clear
66%
27°
37°
Wed
8/19
Mostly Cloudy
65%
26°
37°
Thu
8/20
Partly Cloudy
82%
25°
34°
Fri
8/21
Thunderstorm
81%
25°
35°
Sat
8/22
Rain
81%
26°
34°
Sun
8/23
Drizzle
60%
25°
34°
Mon
8/24
Drizzle
60%
26°
33°
Tue
8/25
Drizzle
60%
26°
33°
Wed
8/26
Drizzle
60%
26°
34°
Thu
8/27
Drizzle
60%
26°
33°
Fri
8/28
Drizzle
60%
26°
33°
Sat
8/29
Drizzle
60%
26°
33°
Sun
8/30
Drizzle
60%
26°
32°
Mon
8/31
Drizzle
60%
25°
32°
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 34 52
Thu 53 Moderate 41 53
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, 18:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3043 J/kg
MLCAPE3316 J/kg
MUCAPE3557 J/kg
SBCIN-6 J/kg
MLCIN-5 J/kg
Lifted Index-6.1
Kinematics
0–6 km Shear1 kt
0–1 km Shear11 kt
Eff. Shear9 kt
0–1 km SRH44
0–3 km SRH53
Eff. SRH53
Storm Motion341° @ 19 kt
0–1 km EHI0.8
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index40.2
Thermo & Levels
PWAT2.52 in
0–3 km LR7.5 °C/km
700–500 LR5.3 °C/km
Total Totals47.8
LCL885 hPa
LFC860 hPa
EL132 hPa
Freezing Lvl16,585 ft