Heat Advisory — Grayson, TX, Fannin, TX, Lamar, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Johnson, TX, Ellis, TX, Henderson, TX, Hill, TX, Navarro, TX, Freestone, TX, Anderson, TX, Bell, TX, McLennan, TX, Falls, TX, Limestone, TX, Leon, TX, Milam, TX, Robertson, TX 8:00 PM

McLennan County, Texas, United States

Last updated: 3:52 PM CDT  ·  Refresh
36°C
Feels like 38°
Clear
▲ 38°  /  ▼ 23°
Wind
10 mph S
Humidity
38%
Dew Point
21°
Pressure
29.41 inHg
Visibility
10 mi
UV Index
7.9
Cloud Cover
2%
Sunrise
7:11 AM
Sunset
7:37 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: McLennan County is currently clear at 35°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1877 J/kg) — isolated convective development possible. Sunrise: 7:11AM · Sunset: 7:37PM.

Alerts

Heat Advisory
Grayson, TX, Fannin, TX, Lamar, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Van Zandt, TX, Rains, TX, Johnson, TX, Ellis, TX, Henderson, TX, Hill, TX, Navarro, TX, Freestone, TX, Anderson, TX, Bell, TX, McLennan, TX, Falls, TX, Limestone, TX, Leon, TX, Milam, TX, Robertson, TX
Expires 8:00 PM
40 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
36°
4%
4 PM
36°
5%
5 PM
36°
5%
6 PM
34°
5%
7 PM
32°
5%
8 PM
31°
5%
9 PM
30°
5%
10 PM
29°
5%
11 PM
29°
3%
12 AM
28°
3%
1 AM
27°
3%
2 AM
27°
3%
3 AM
27°
3%
4 AM
26°
3%
5 AM
24°
3%
6 AM
23°
3%
7 AM
24°
3%
8 AM
25°
3%
9 AM
27°
3%
10 AM
29°
3%
11 AM
29°
3%
12 PM
31°
3%
1 PM
32°
3%
2 PM
33°
3%
7-Day Forecast
Today
38° 23°
Clear.
Mon
38° 23°
Clear.
Tue
38° 22°
Clear.
Wed
36° 23°
Clear.
Thu
35° 23°
Clear.
Fri
36° 23°
Clear.
Sat
35° 22°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 36° Clear 4% 10 mph S 38%
4 PM 36° Clear 5% 11 mph S 40%
5 PM 36° Mostly Clear 5% 12 mph SSE 42%
6 PM 34° Mostly Clear 5% 12 mph SSE 46%
7 PM 32° Clear 5% 10 mph SSE 48%
8 PM 31° Clear 5% 11 mph SSE 51%
9 PM 30° Clear 5% 12 mph S 57%
10 PM 29° Clear 5% 12 mph S 63%
11 PM 29° Clear 3% 12 mph S 67%
12 AM 28° Clear 3% 11 mph S 71%
1 AM 27° Mostly Clear 3% 10 mph S 73%
2 AM 27° Mostly Clear 3% 9 mph S 76%
3 AM 27° Partly Cloudy 3% 9 mph S 78%
4 AM 26° Mostly Clear 3% 8 mph S 79%
5 AM 24° Mostly Clear 3% 8 mph S 81%
6 AM 23° Mostly Clear 3% 7 mph S 82%
7 AM 24° Clear 3% 7 mph S 78%
8 AM 25° Clear 3% 8 mph S 72%
9 AM 27° Clear 3% 8 mph S 68%
10 AM 29° Mostly Clear 3% 9 mph S 64%
11 AM 29° Mostly Clear 3% 9 mph S 60%
12 PM 31° Mostly Clear 3% 9 mph S 56%
1 PM 32° Mostly Clear 3% 10 mph S 53%
2 PM 33° Mostly Clear 3% 10 mph S 51%
15-Day Forecast
Today
9/13
Clear
5%
23°
38°
Mon
9/14
Clear
7%
23°
38°
Tue
9/15
Clear
8%
22°
38°
Wed
9/16
Clear
3%
23°
36°
Thu
9/17
Clear
3%
23°
35°
Fri
9/18
Clear
3%
23°
36°
Sat
9/19
Clear
19%
22°
35°
Sun
9/20
Clear
60%
23°
34°
Mon
9/21
Drizzle
60%
21°
33°
Tue
9/22
Drizzle
60%
18°
33°
Wed
9/23
Drizzle
60%
20°
32°
Thu
9/24
Drizzle
60%
22°
32°
Fri
9/25
Drizzle
60%
22°
31°
Sat
9/26
Clear
60%
21°
32°
Sun
9/27
Drizzle
60%
21°
31°
40
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
40 AQI 7.3 µg/m³
O3
Ground-level ozone
31 AQI 35 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 40 Good 31 40
Tue 32 Good 32 32
Wed 37 Good 37 33
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 Sun Sep 13, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2417 J/kg
MLCAPE1518 J/kg
MUCAPE2417 J/kg
SBCIN-3 J/kg
MLCIN-38 J/kg
Lifted Index-4.1
Kinematics
0–6 km Shear9 kt
0–1 km Shear3 kt
Eff. Shear10 kt
0–1 km SRH-8
0–3 km SRH6
Eff. SRH6
Storm Motion136° @ 19 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.7
Thermo & Levels
PWAT1.67 in
0–3 km LR8.3 °C/km
700–500 LR5.2 °C/km
Total Totals44.5
LCL812 hPa
LFC769 hPa
EL147 hPa
Freezing Lvl16,713 ft