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: 2:04 PM CDT  ·  Refresh
34°C
Feels like 44°
Mostly Clear
▲ 36°  /  ▼ 27°
Wind
6 mph WSW
Humidity
65%
Dew Point
24°
Pressure
29.98 inHg
Visibility
10 mi
UV Index
9.0
Cloud Cover
27%
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 34°C. Precipitation is likely — peak probability 58% around 7 PM. Atmospheric instability is elevated (CAPE up to 3374 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
34°
48%
4 PM
34°
45%
5 PM
34°
47%
6 PM
33°
45%
7 PM
32°
58%
8 PM
31°
49%
9 PM
31°
53%
10 PM
29°
54%
11 PM
29°
41%
12 AM
29°
42%
1 AM
28°
38%
2 AM
28°
9%
3 AM
28°
9%
4 AM
28°
9%
5 AM
28°
10%
6 AM
27°
10%
7 AM
27°
3%
8 AM
27°
3%
9 AM
28°
23%
10 AM
31°
27%
11 AM
31°
28%
12 PM
32°
28%
1 PM
32°
29%
2 PM
34°
44%
7-Day Forecast
Today
36° 27°
Partly Cloudy with a 53% chance of rain.
Tue
37° 27°
Mostly Clear with a 70% chance of rain.
Wed
37° 26°
Mostly Cloudy with a 61% chance of rain.
Thu
34° 25°
Partly Cloudy with a 82% chance of rain.
Fri
35° 25°
Rain, 81% chance.
Sat
33° 26°
Drizzle, 81% chance.
Sun
34° 25°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 34° Mostly Clear 48% 6 mph WSW 65%
4 PM 34° Mostly Clear 45% 5 mph S 66%
5 PM 34° Mostly Cloudy 47% 6 mph S 68%
6 PM 33° Mostly Cloudy 45% 6 mph S 73%
7 PM 32° Rain 58% 8 mph SE 76%
8 PM 31° Partly Cloudy 49% 8 mph SSE 81%
9 PM 31° Mostly Clear 53% 6 mph S 81%
10 PM 29° Mostly Clear 54% 6 mph SW 82%
11 PM 29° Clear 41% 9 mph WSW 82%
12 AM 29° Mostly Clear 42% 9 mph WSW 82%
1 AM 28° Partly Cloudy 38% 9 mph WSW 83%
2 AM 28° Mostly Cloudy 9% 10 mph WSW 83%
3 AM 28° Partly Cloudy 9% 10 mph WSW 83%
4 AM 28° Partly Cloudy 9% 10 mph WSW 84%
5 AM 28° Mostly Clear 10% 10 mph WSW 84%
6 AM 27° Mostly Clear 10% 10 mph WSW 85%
7 AM 27° Mostly Clear 3% 9 mph WSW 85%
8 AM 27° Mostly Clear 3% 9 mph WSW 86%
9 AM 28° Mostly Clear 23% 9 mph WSW 81%
10 AM 31° Mostly Clear 27% 9 mph W 76%
11 AM 31° Mostly Clear 28% 9 mph W 72%
12 PM 32° Mostly Clear 28% 8 mph W 71%
1 PM 32° Mostly Clear 29% 8 mph W 69%
2 PM 34° Partly Cloudy 44% 7 mph WSW 67%
15-Day Forecast
Today
8/17
Partly Cloudy
53%
27°
36°
Tue
8/18
Mostly Clear
70%
27°
37°
Wed
8/19
Mostly Cloudy
61%
26°
37°
Thu
8/20
Partly Cloudy
82%
25°
34°
Fri
8/21
Rain
81%
25°
35°
Sat
8/22
Drizzle
81%
26°
33°
Sun
8/23
Drizzle
60%
25°
34°
Mon
8/24
Drizzle
60%
26°
34°
Tue
8/25
Drizzle
60%
26°
34°
Wed
8/26
Drizzle
60%
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°
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, 17:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3230 J/kg
MLCAPE3155 J/kg
MUCAPE3371 J/kg
SBCIN-0 J/kg
MLCIN-6 J/kg
Lifted Index-6.3
Kinematics
0–6 km Shear1 kt
0–1 km Shear9 kt
Eff. Shear10 kt
0–1 km SRH-27
0–3 km SRH-39
Eff. SRH-39
Storm Motion226° @ 16 kt
0–1 km EHI-0.5
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index40.2
Thermo & Levels
PWAT2.46 in
0–3 km LR7.7 °C/km
700–500 LR5.2 °C/km
Total Totals47.5
LCL881 hPa
LFC872 hPa
EL130 hPa
Freezing Lvl16,640 ft