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

Lamar County, Texas, United States

Last updated: 3:49 PM CDT  ·  Refresh
37°C
Feels like 39°
Mostly Clear
▲ 39°  /  ▼ 23°
Wind
8 mph S
Humidity
32%
Dew Point
19°
Pressure
29.38 inHg
Visibility
10 mi
UV Index
7.7
Cloud Cover
12%
Sunrise
7:03 AM
Sunset
7:31 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lamar County is currently mostly clear at 37°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1598 J/kg) — isolated convective development possible. Sunrise: 7:03AM · Sunset: 7:31PM.

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
39 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
37°
3%
4 PM
38°
3%
5 PM
39°
3%
6 PM
37°
3%
7 PM
36°
3%
8 PM
33°
3%
9 PM
31°
19%
10 PM
30°
3%
11 PM
29°
3%
12 AM
28°
3%
1 AM
27°
3%
2 AM
26°
5%
3 AM
26°
5%
4 AM
25°
5%
5 AM
23°
5%
6 AM
23°
5%
7 AM
24°
5%
8 AM
26°
5%
9 AM
27°
5%
10 AM
30°
5%
11 AM
31°
3%
12 PM
32°
3%
1 PM
34°
3%
2 PM
35°
3%
7-Day Forecast
Today
39° 23°
Mostly Clear.
Mon
39° 23°
Mostly Clear.
Tue
40° 23°
Clear.
Wed
39° 22°
Clear.
Thu
38° 22°
Clear.
Fri
39° 22°
Clear with a 25% chance of rain.
Sat
39° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 37° Mostly Clear 3% 8 mph S 32%
4 PM 38° Mostly Clear 3% 8 mph SSE 32%
5 PM 39° Mostly Clear 3% 8 mph SSE 33%
6 PM 37° Mostly Clear 3% 8 mph SSE 35%
7 PM 36° Mostly Clear 3% 7 mph SSE 39%
8 PM 33° Mostly Clear 3% 7 mph SSE 43%
9 PM 31° Mostly Cloudy 19% 7 mph SE 47%
10 PM 30° Partly Cloudy 3% 7 mph SSE 52%
11 PM 29° Partly Cloudy 3% 8 mph S 56%
12 AM 28° Partly Cloudy 3% 8 mph S 61%
1 AM 27° Partly Cloudy 3% 8 mph S 65%
2 AM 26° Partly Cloudy 5% 7 mph S 70%
3 AM 26° Partly Cloudy 5% 6 mph S 75%
4 AM 25° Mostly Clear 5% 6 mph S 80%
5 AM 23° Mostly Clear 5% 6 mph S 83%
6 AM 23° Clear 5% 5 mph S 86%
7 AM 24° Clear 5% 6 mph S 81%
8 AM 26° Mostly Clear 5% 7 mph SSW 72%
9 AM 27° Mostly Clear 5% 7 mph SSW 65%
10 AM 30° Mostly Clear 5% 8 mph SSW 60%
11 AM 31° Mostly Clear 3% 8 mph SSW 54%
12 PM 32° Clear 3% 8 mph SSW 49%
1 PM 34° Clear 3% 8 mph SSW 47%
2 PM 35° Clear 3% 8 mph S 46%
15-Day Forecast
Today
9/13
Mostly Clear
19%
23°
39°
Mon
9/14
Mostly Clear
5%
23°
39°
Tue
9/15
Clear
8%
23°
40°
Wed
9/16
Clear
8%
22°
39°
Thu
9/17
Clear
9%
22°
38°
Fri
9/18
Clear
25%
22°
39°
Sat
9/19
Clear
19%
23°
39°
Sun
9/20
Clear
60%
21°
36°
Mon
9/21
Drizzle
60%
17°
34°
Tue
9/22
Drizzle
60%
14°
33°
Wed
9/23
Drizzle
60%
16°
33°
Thu
9/24
Drizzle
60%
19°
33°
Fri
9/25
Clear
25%
19°
33°
Sat
9/26
Drizzle
60%
19°
33°
Sun
9/27
Drizzle
60%
19°
33°
39
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
36 AQI 6.5 µg/m³
O3
Ground-level ozone
Dominant
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 39 Good 39 36
Tue 35 Good 35 31
Wed 36 Good 36 29
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
SBCAPE1886 J/kg
MLCAPE776 J/kg
MUCAPE1886 J/kg
SBCIN0 J/kg
MLCIN-12 J/kg
Lifted Index-4.7
Kinematics
0–6 km Shear16 kt
0–1 km Shear2 kt
Eff. Shear16 kt
0–1 km SRH-4
0–3 km SRH13
Eff. SRH13
Storm Motion86° @ 14 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.0
Thermo & Levels
PWAT1.90 in
0–3 km LR9.0 °C/km
700–500 LR6.0 °C/km
Total Totals47.9
LCL766 hPa
LFC995 hPa
EL158 hPa
Freezing Lvl15,827 ft