Heat Advisory — Llano, TX, Burnet, TX, Williamson, TX, Hays, TX, Travis, TX, Bastrop, TX, Lee, TX, Bexar, TX, Comal, TX, Guadalupe, TX, Caldwell, TX, Fayette, TX, Atascosa, TX, Wilson, TX, Karnes, TX, Gonzales, TX, De Witt, TX, Lavaca, TX 7:00 PM

Williamson County, Texas, United States

Last updated: 10:08 PM CDT  ·  Refresh
33°C
Feels like 34°
Clear
▲ 39°  /  ▼ 24°
Wind
6 mph SSE
Humidity
42%
Dew Point
16°
Pressure
29.24 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
7:00 AM
Sunset
8:05 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Williamson County is currently clear at 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1686 J/kg) — isolated convective development possible. Sunrise: 7:00AM · Sunset: 8:05PM.

Alerts

Heat Advisory
Llano, TX, Burnet, TX, Williamson, TX, Hays, TX, Travis, TX, Bastrop, TX, Lee, TX, Bexar, TX, Comal, TX, Guadalupe, TX, Caldwell, TX, Fayette, TX, Atascosa, TX, Wilson, TX, Karnes, TX, Gonzales, TX, De Witt, TX, Lavaca, TX
Expires 7:00 PM
59 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
3%
11 PM
33°
7%
12 AM
31°
7%
1 AM
31°
3%
2 AM
29°
3%
3 AM
28°
3%
4 AM
28°
3%
5 AM
27°
3%
6 AM
24°
3%
7 AM
24°
3%
8 AM
26°
8%
9 AM
29°
8%
10 AM
32°
8%
11 AM
33°
17%
12 PM
36°
17%
1 PM
37°
19%
2 PM
39°
22%
3 PM
40°
12%
4 PM
40°
12%
5 PM
42°
12%
6 PM
40°
17%
7 PM
39°
10%
8 PM
38°
10%
9 PM
36°
11%
7-Day Forecast
Tonight
39° 24°
Clear.
Sat
42° 24°
Mostly Clear.
Sun
42° 24°
Mostly Clear.
Mon
41° 23°
Mostly Clear.
Tue
42° 25°
Clear.
Wed
42° 24°
Rain, 55% chance.
Thu
40° 24°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 3% 6 mph SSE 42%
11 PM 33° Clear 7% 8 mph SSE 44%
12 AM 31° Clear 7% 11 mph S 56%
1 AM 31° Clear 3% 12 mph SSW 62%
2 AM 29° Partly Cloudy 3% 10 mph SSW 62%
3 AM 28° Mostly Cloudy 3% 9 mph SSW 63%
4 AM 28° Mostly Cloudy 3% 7 mph SW 64%
5 AM 27° Mostly Cloudy 3% 6 mph SW 66%
6 AM 24° Mostly Cloudy 3% 6 mph SW 68%
7 AM 24° Partly Cloudy 3% 6 mph SW 68%
8 AM 26° Partly Cloudy 8% 7 mph SW 62%
9 AM 29° Partly Cloudy 8% 8 mph SW 54%
10 AM 32° Partly Cloudy 8% 9 mph SW 46%
11 AM 33° Mostly Clear 17% 7 mph SW 39%
12 PM 36° Mostly Clear 17% 6 mph SW 33%
1 PM 37° Mostly Clear 19% 4 mph SSW 28%
2 PM 39° Mostly Clear 22% 4 mph S 27%
3 PM 40° Clear 12% 5 mph SSE 25%
4 PM 40° Clear 12% 6 mph SSE 24%
5 PM 42° Mostly Clear 12% 7 mph SSE 25%
6 PM 40° Mostly Clear 17% 9 mph S 26%
7 PM 39° Mostly Clear 10% 9 mph SSE 26%
8 PM 38° Mostly Clear 10% 9 mph SSE 29%
9 PM 36° Partly Cloudy 11% 10 mph SSE 32%
15-Day Forecast
Today
8/21
Clear
3%
24°
39°
Sat
8/22
Mostly Clear
19%
24°
42°
Sun
8/23
Mostly Clear
7%
24°
42°
Mon
8/24
Mostly Clear
7%
23°
41°
Tue
8/25
Clear
8%
25°
42°
Wed
8/26
Rain
55%
24°
42°
Thu
8/27
Drizzle
52%
24°
40°
Fri
8/28
Clear
17%
25°
40°
Sat
8/29
Clear
18%
23°
40°
Sun
8/30
Clear
19%
23°
40°
Mon
8/31
Clear
3%
23°
38°
Tue
9/1
Clear
25%
24°
40°
Wed
9/2
Drizzle
60%
24°
40°
Thu
9/3
Clear
25%
24°
39°
Fri
9/4
Clear
60%
24°
39°
59
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
59 AQI 13.3 µg/m³
O3
Ground-level ozone
44 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 59 Moderate 44 59
Sun 59 Moderate 43 59
Mon 57 Moderate 42 57
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 Sat Aug 22, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE49 J/kg
MLCAPE360 J/kg
MUCAPE466 J/kg
SBCIN-544 J/kg
MLCIN-248 J/kg
Lifted Index-0.0
Kinematics
0–6 km Shear23 kt
0–1 km Shear4 kt
Eff. Shear23 kt
0–1 km SRH-16
0–3 km SRH36
Eff. SRH43
Storm Motion110° @ 21 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.2
K-Index23.0
Thermo & Levels
PWAT1.39 in
0–3 km LR6.6 °C/km
700–500 LR6.9 °C/km
Total Totals48.1
LCL779 hPa
LFC463 hPa
EL279 hPa
Freezing Lvl15,249 ft