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

Union County, Florida, United States

Last updated: 12:37 PM CDT  ·  Refresh
35°C
Feels like 42°
Mostly Clear
▲ 37°  /  ▼ 25°
Wind
9 mph W
Humidity
54%
Dew Point
24°
Pressure
29.91 inHg
Visibility
10 mi
UV Index
9.6
Cloud Cover
23%
Sunrise
6:58 AM
Sunset
8:08 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently mostly clear at 35°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2947 J/kg) — isolated convective development possible. Sunrise: 6:58AM · Sunset: 8:08PM.

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
57 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
35°
3%
2 PM
37°
14%
3 PM
37°
16%
4 PM
37°
16%
5 PM
37°
16%
6 PM
36°
19%
7 PM
34°
19%
8 PM
32°
20%
9 PM
29°
20%
10 PM
28°
13%
11 PM
28°
13%
12 AM
27°
16%
1 AM
27°
11%
2 AM
27°
17%
3 AM
26°
14%
4 AM
26°
23%
5 AM
25°
28%
6 AM
25°
29%
7 AM
25°
27%
8 AM
26°
29%
9 AM
29°
34%
10 AM
31°
35%
11 AM
31°
39%
12 PM
32°
44%
7-Day Forecast
Today
37° 25°
Partly Cloudy.
Tue
38° 25°
Rain, 63% chance.
Wed
39° 23°
Mostly Cloudy with a 42% chance of rain.
Thu
36° 23°
Mostly Cloudy with a 70% chance of rain.
Fri
36° 23°
Drizzle, 45% chance.
Sat
32° 23°
Rain, 82% chance.
Sun
32° 22°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 35° Mostly Clear 3% 9 mph W 54%
2 PM 37° Mostly Clear 14% 9 mph W 49%
3 PM 37° Partly Cloudy 16% 9 mph W 48%
4 PM 37° Partly Cloudy 16% 9 mph W 48%
5 PM 37° Partly Cloudy 16% 9 mph WSW 51%
6 PM 36° Partly Cloudy 19% 9 mph WSW 56%
7 PM 34° Partly Cloudy 19% 9 mph WSW 62%
8 PM 32° Partly Cloudy 20% 9 mph WSW 67%
9 PM 29° Mostly Cloudy 20% 8 mph WSW 72%
10 PM 28° Mostly Cloudy 13% 7 mph WSW 77%
11 PM 28° Mostly Cloudy 13% 7 mph WSW 79%
12 AM 27° Partly Cloudy 16% 6 mph WSW 79%
1 AM 27° Partly Cloudy 11% 6 mph WSW 80%
2 AM 27° Partly Cloudy 17% 6 mph W 81%
3 AM 26° Partly Cloudy 14% 6 mph W 82%
4 AM 26° Partly Cloudy 23% 5 mph W 83%
5 AM 25° Partly Cloudy 28% 5 mph W 84%
6 AM 25° Partly Cloudy 29% 5 mph WSW 85%
7 AM 25° Partly Cloudy 27% 6 mph WSW 85%
8 AM 26° Partly Cloudy 29% 6 mph W 81%
9 AM 29° Partly Cloudy 34% 6 mph W 75%
10 AM 31° Rain 35% 7 mph W 69%
11 AM 31° Rain 39% 7 mph W 64%
12 PM 32° Mostly Clear 44% 7 mph W 60%
15-Day Forecast
Today
8/17
Partly Cloudy
19%
25°
37°
Tue
8/18
Rain
63%
25°
38°
Wed
8/19
Mostly Cloudy
42%
23°
39°
Thu
8/20
Mostly Cloudy
70%
23°
36°
Fri
8/21
Drizzle
45%
23°
36°
Sat
8/22
Rain
82%
23°
32°
Sun
8/23
Rain
64%
22°
32°
Mon
8/24
Drizzle
53%
21°
34°
Tue
8/25
Drizzle
44%
22°
35°
Wed
8/26
Drizzle
60%
24°
36°
Thu
8/27
Drizzle
60%
23°
36°
Fri
8/28
Rain
90%
24°
34°
Sat
8/29
Drizzle
60%
24°
34°
Sun
8/30
Drizzle
60%
23°
33°
Mon
8/31
Drizzle
60%
23°
34°
57
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
57 AQI 12.2 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 57 Moderate 31 57
Wed 55 Moderate 33 55
Thu 55 Moderate 36 55
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
SBCAPE3688 J/kg
MLCAPE3301 J/kg
MUCAPE3688 J/kg
SBCIN-0 J/kg
MLCIN-7 J/kg
Lifted Index-7.3
Kinematics
0–6 km Shear7 kt
0–1 km Shear4 kt
Eff. Shear14 kt
0–1 km SRH-5
0–3 km SRH-12
Eff. SRH-12
Storm Motion232° @ 17 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.7
Thermo & Levels
PWAT2.34 in
0–3 km LR7.9 °C/km
700–500 LR5.6 °C/km
Total Totals47.7
LCL870 hPa
LFC871 hPa
EL123 hPa
Freezing Lvl16,673 ft