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

Collin County, Texas, United States

Last updated: 3:47 PM CDT  ·  Refresh
37°C
Feels like 38°
Clear
▲ 39°  /  ▼ 24°
Wind
12 mph S
Humidity
33%
Dew Point
19°
Pressure
29,31 inHg
Visibility
10 mi
UV Index
7,9
Cloud Cover
1%
Sunrise
7:08 AM
Sunset
7:35 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Collin County is currently clear at 37°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1565 J/kg) — isolated convective development possible. Sunrise: 7:08AM · Sunset: 7:35PM.

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: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
37°
3%
4 PM
38°
5%
5 PM
38°
5%
6 PM
37°
5%
7 PM
36°
5%
8 PM
34°
5%
9 PM
33°
5%
10 PM
32°
3%
11 PM
31°
3%
12 AM
30°
3%
1 AM
29°
3%
2 AM
28°
3%
3 AM
28°
3%
4 AM
27°
5%
5 AM
24°
5%
6 AM
24°
5%
7 AM
24°
5%
8 AM
26°
5%
9 AM
27°
5%
10 AM
29°
3%
11 AM
31°
3%
12 PM
31°
3%
1 PM
34°
3%
2 PM
34°
3%
7-Day Forecast
Today
39° 24°
Clear.
Mon
39° 24°
Clear.
Tue
39° 24°
Mostly Clear.
Wed
37° 23°
Clear.
Thu
36° 25°
Clear.
Fri
37° 25°
Clear with a 43% chance of rain.
Sat
37° 25°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 37° Clear 3% 12 mph S 33%
4 PM 38° Clear 5% 12 mph S 35%
5 PM 38° Clear 5% 12 mph S 36%
6 PM 37° Clear 5% 11 mph S 37%
7 PM 36° Clear 5% 9 mph SSE 40%
8 PM 34° Mostly Clear 5% 8 mph SSE 43%
9 PM 33° Mostly Clear 5% 9 mph SSE 46%
10 PM 32° Mostly Clear 3% 9 mph SSE 49%
11 PM 31° Mostly Clear 3% 10 mph SSE 53%
12 AM 30° Mostly Clear 3% 10 mph SSE 58%
1 AM 29° Clear 3% 10 mph S 62%
2 AM 28° Clear 3% 9 mph S 64%
3 AM 28° Clear 3% 8 mph S 67%
4 AM 27° Clear 5% 8 mph S 70%
5 AM 24° Clear 5% 7 mph S 73%
6 AM 24° Clear 5% 7 mph S 76%
7 AM 24° Clear 5% 7 mph S 74%
8 AM 26° Clear 5% 8 mph S 68%
9 AM 27° Clear 5% 9 mph SSW 64%
10 AM 29° Clear 3% 9 mph SSW 59%
11 AM 31° Clear 3% 10 mph SSW 55%
12 PM 31° Clear 3% 10 mph S 50%
1 PM 34° Clear 3% 10 mph S 48%
2 PM 34° Clear 3% 10 mph S 46%
15-Day Forecast
Today
9/13
Clear
5%
24°
39°
Mon
9/14
Clear
5%
24°
39°
Tue
9/15
Mostly Clear
3%
24°
39°
Wed
9/16
Clear
3%
23°
37°
Thu
9/17
Clear
9%
25°
36°
Fri
9/18
Clear
43%
25°
37°
Sat
9/19
Clear
19%
25°
37°
Sun
9/20
Drizzle
60%
23°
34°
Mon
9/21
Drizzle
60%
18°
33°
Tue
9/22
Drizzle
60%
17°
33°
Wed
9/23
Drizzle
60%
20°
32°
Thu
9/24
Clear
60%
21°
32°
Fri
9/25
Clear
25%
21°
32°
Sat
9/26
Clear
60%
21°
32°
Sun
9/27
Clear
60%
21°
32°
40
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
38 AQI 6.9 µg/m³
O3
Ground-level ozone
Dominant
40 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 40 Good 40 38
Tue 40 Good 40 33
Wed 39 Good 39 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 dim. 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
SBCAPE1560 J/kg
MLCAPE164 J/kg
MUCAPE1560 J/kg
SBCIN-19 J/kg
MLCIN-170 J/kg
Lifted Index-4.3
Kinematics
0–6 km Shear15 kt
0–1 km Shear1 kt
Eff. Shear19 kt
0–1 km SRH1
0–3 km SRH33
Eff. SRH33
Storm Motion91° @ 14 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.5
Thermo & Levels
PWAT1.47 in
0–3 km LR8.5 °C/km
700–500 LR6.2 °C/km
Total Totals44.2
LCL769 hPa
LFC720 hPa
EL160 hPa
Freezing Lvl16,089 ft