Heat Advisory — Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, TX, Jack, TX, Wise, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Palo Pinto, TX, Parker, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Johnson, TX, Ellis, TX 8:00 PM

Grayson County, Texas, United States

Last updated: 6:01 AM CDT  ·  Refresh
26°C
Feels like 27°
Clear
▲ 37°  /  ▼ 26°
Wind
10 mph S
Humidity
73%
Dew Point
21°
Pressure
29.21 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
Sunrise
6:46 AM
Sunset
8:16 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Grayson County is currently clear at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2032 J/kg) — isolated convective development possible. Sunrise: 6:46AM · Sunset: 8:16PM.

Alerts

Heat Advisory
Montague, TX, Cooke, TX, Grayson, TX, Fannin, TX, Lamar, TX, Jack, TX, Wise, TX, Denton, TX, Collin, TX, Hunt, TX, Delta, TX, Hopkins, TX, Palo Pinto, TX, Parker, TX, Tarrant, TX, Dallas, TX, Rockwall, TX, Kaufman, TX, Johnson, TX, Ellis, TX
Expires 8:00 PM
44 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
3%
7 AM
24°
3%
8 AM
25°
3%
9 AM
27°
3%
10 AM
28°
3%
11 AM
30°
3%
12 PM
32°
3%
1 PM
33°
3%
2 PM
36°
3%
3 PM
36°
3%
4 PM
37°
3%
5 PM
37°
3%
6 PM
37°
3%
7 PM
37°
3%
8 PM
35°
3%
9 PM
33°
3%
10 PM
32°
3%
11 PM
31°
3%
12 AM
31°
3%
1 AM
29°
3%
2 AM
29°
3%
3 AM
29°
3%
4 AM
28°
3%
5 AM
27°
3%
7-Day Forecast
Today
37° 26°
Clear.
Wed
40° 26°
Clear.
Thu
39° 24°
Clear.
Fri
39° 23°
Clear.
Sat
41° 25°
Mostly Clear.
Sun
41° 24°
Mostly Clear.
Mon
41° 25°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 3% 10 mph S 73%
7 AM 24° Clear 3% 11 mph SSW 70%
8 AM 25° Clear 3% 13 mph SSW 66%
9 AM 27° Clear 3% 14 mph SSW 62%
10 AM 28° Clear 3% 14 mph SSW 56%
11 AM 30° Clear 3% 14 mph SSW 52%
12 PM 32° Clear 3% 13 mph SSW 47%
1 PM 33° Clear 3% 13 mph SSW 42%
2 PM 36° Clear 3% 13 mph SSW 39%
3 PM 36° Clear 3% 12 mph SSW 36%
4 PM 37° Clear 3% 12 mph SSW 33%
5 PM 37° Clear 3% 13 mph SSW 32%
6 PM 37° Clear 3% 14 mph SSW 32%
7 PM 37° Clear 3% 14 mph SSW 33%
8 PM 35° Clear 3% 13 mph S 37%
9 PM 33° Clear 3% 12 mph S 40%
10 PM 32° Clear 3% 12 mph S 44%
11 PM 31° Clear 3% 13 mph S 47%
12 AM 31° Clear 3% 13 mph S 50%
1 AM 29° Clear 3% 14 mph S 52%
2 AM 29° Clear 3% 14 mph S 55%
3 AM 29° Clear 3% 14 mph S 58%
4 AM 28° Clear 3% 14 mph SSW 61%
5 AM 27° Clear 3% 14 mph SSW 63%
15-Day Forecast
Today
8/11
Clear
3%
26°
37°
Wed
8/12
Clear
3%
26°
40°
Thu
8/13
Clear
3%
24°
39°
Fri
8/14
Clear
3%
23°
39°
Sat
8/15
Mostly Clear
3%
25°
41°
Sun
8/16
Mostly Clear
3%
24°
41°
Mon
8/17
Clear
3%
25°
41°
Tue
8/18
Mostly Clear
34%
26°
41°
Wed
8/19
Clear
15%
27°
41°
Thu
8/20
Mostly Clear
11%
27°
40°
Fri
8/21
Clear
25%
27°
41°
Sat
8/22
Clear
60%
27°
41°
Sun
8/23
Drizzle
60%
27°
40°
Mon
8/24
Drizzle
60%
27°
39°
Tue
8/25
Drizzle
60%
26°
39°
44
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
28 AQI 5.0 µg/m³
O3
Ground-level ozone
Dominant
44 AQI 48 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 44 Good 44 28
Wed 52 Moderate 44 52
Thu 45 Good 45 34
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 Tue Aug 11, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE453 J/kg
MLCAPE103 J/kg
MUCAPE453 J/kg
SBCIN-315 J/kg
MLCIN0 J/kg
Lifted Index-1.7
Kinematics
0–6 km Shear8 kt
0–1 km Shear9 kt
Eff. Shear8 kt
0–1 km SRH32
0–3 km SRH17
Eff. SRH-3
Storm Motion341° @ 8 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.0
Thermo & Levels
PWAT1.37 in
0–3 km LR5.0 °C/km
700–500 LR6.2 °C/km
Total Totals45.7
LCL919 hPa
LFC640 hPa
EL233 hPa
Freezing Lvl15,630 ft