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 p. m.

Grayson County, Texas, United States

Last updated: 3:47 p. m. CDT  ·  Refresh
37°C
Feels like 37°
Clear
▲ 38°  /  ▼ 23°
Wind
10 mph S
Humidity
30%
Dew Point
18°
Pressure
29,11 inHg
Visibility
10 mi
UV Index
7,9
Cloud Cover
1%
Sunrise
7:08 a. m.
Sunset
7:35 p. m.
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Grayson County is currently clear at 37°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1533 J/kg) — isolated convective development possible. Sunrise: 7:08A. M. · Sunset: 7:35P. M..

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 p. m.
44 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
37°
3%
4 p. m.
37°
3%
5 p. m.
38°
3%
6 p. m.
36°
3%
7 p. m.
34°
3%
8 p. m.
33°
3%
9 p. m.
31°
3%
10 p. m.
31°
3%
11 p. m.
30°
3%
12 a. m.
29°
3%
1 a. m.
28°
3%
2 a. m.
28°
3%
3 a. m.
27°
3%
4 a. m.
27°
5%
5 a. m.
23°
5%
6 a. m.
23°
5%
7 a. m.
24°
5%
8 a. m.
26°
5%
9 a. m.
27°
5%
10 a. m.
29°
3%
11 a. m.
31°
3%
12 p. m.
31°
3%
1 p. m.
33°
3%
2 p. m.
34°
3%
7-Day Forecast
Today
38° 23°
Clear.
Mon
39° 23°
Clear.
Tue
39° 23°
Mostly Clear.
Wed
37° 21°
Clear.
Thu
36° 23°
Clear.
Fri
37° 23°
Drizzle, 43% chance.
Sat
37° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 37° Clear 3% 10 mph S 30%
4 p. m. 37° Clear 3% 12 mph S 31%
5 p. m. 38° Clear 3% 12 mph S 33%
6 p. m. 36° Clear 3% 11 mph S 36%
7 p. m. 34° Clear 3% 10 mph SSE 39%
8 p. m. 33° Clear 3% 9 mph SSE 42%
9 p. m. 31° Mostly Clear 3% 9 mph SSE 45%
10 p. m. 31° Mostly Clear 3% 9 mph SSE 49%
11 p. m. 30° Mostly Clear 3% 10 mph SSE 53%
12 a. m. 29° Mostly Clear 3% 11 mph SSE 57%
1 a. m. 28° Mostly Clear 3% 11 mph SSE 62%
2 a. m. 28° Mostly Clear 3% 10 mph S 66%
3 a. m. 27° Mostly Clear 3% 9 mph S 69%
4 a. m. 27° Clear 5% 9 mph S 72%
5 a. m. 23° Clear 5% 9 mph S 75%
6 a. m. 23° Clear 5% 8 mph S 78%
7 a. m. 24° Clear 5% 9 mph S 74%
8 a. m. 26° Clear 5% 10 mph SSW 67%
9 a. m. 27° Clear 5% 11 mph SSW 61%
10 a. m. 29° Clear 3% 11 mph SSW 57%
11 a. m. 31° Clear 3% 11 mph SSW 52%
12 p. m. 31° Clear 3% 12 mph SSW 48%
1 p. m. 33° Clear 3% 12 mph S 46%
2 p. m. 34° Clear 3% 12 mph S 44%
15-Day Forecast
Today
9/13
Clear
3%
23°
38°
Mon
9/14
Clear
5%
23°
39°
Tue
9/15
Mostly Clear
3%
23°
39°
Wed
9/16
Clear
8%
21°
37°
Thu
9/17
Clear
9%
23°
36°
Fri
9/18
Drizzle
43%
23°
37°
Sat
9/19
Clear
19%
23°
37°
Sun
9/20
Drizzle
60%
22°
33°
Mon
9/21
Drizzle
60%
17°
32°
Tue
9/22
Drizzle
60%
16°
32°
Wed
9/23
Drizzle
60%
18°
32°
Thu
9/24
Drizzle
60%
20°
32°
Fri
9/25
Clear
25%
20°
32°
Sat
9/26
Clear
60%
20°
32°
Sun
9/27
Drizzle
60%
20°
32°
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
37 AQI 6.7 µg/m³
O3
Ground-level ozone
Dominant
44 AQI 48 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 44 Good 44 37
Tue 45 Good 45 34
Wed 44 Good 44 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 dom. sept. 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
SBCAPE1139 J/kg
MLCAPE79 J/kg
MUCAPE1139 J/kg
SBCIN-40 J/kg
MLCIN-230 J/kg
Lifted Index-3.9
Kinematics
0–6 km Shear17 kt
0–1 km Shear2 kt
Eff. Shear19 kt
0–1 km SRH-6
0–3 km SRH33
Eff. SRH33
Storm Motion82° @ 14 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index21.8
Thermo & Levels
PWAT1.35 in
0–3 km LR8.4 °C/km
700–500 LR6.5 °C/km
Total Totals45.2
LCL753 hPa
LFC672 hPa
EL175 hPa
Freezing Lvl15,781 ft