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

Fannin County, Texas, United States

Last updated: 3:50 PM CDT  ·  Refresh
100°F
Feels like 101°
Clear
▲ 101°  /  ▼ 72°
Wind
10 mph S
Humidity
29%
Dew Point
63°
Pressure
29.24 inHg
Visibility
10 mi
UV Index
7.8
Cloud Cover
3%
Sunrise
7:05 AM
Sunset
7:33 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Fannin County is currently clear at 100°F. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1479 J/kg) — isolated convective development possible. Sunrise: 7:05AM · Sunset: 7:33PM.

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
38 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
100°
3%
4 PM
100°
3%
5 PM
101°
3%
6 PM
98°
3%
7 PM
95°
3%
8 PM
91°
3%
9 PM
88°
3%
10 PM
86°
3%
11 PM
85°
3%
12 AM
83°
3%
1 AM
81°
3%
2 AM
80°
3%
3 AM
79°
3%
4 AM
78°
3%
5 AM
73°
3%
6 AM
72°
3%
7 AM
74°
3%
8 AM
77°
3%
9 AM
81°
3%
10 AM
86°
3%
11 AM
88°
3%
12 PM
90°
3%
1 PM
94°
3%
2 PM
95°
3%
7-Day Forecast
Today
101° 72°
Clear.
Mon
103° 72°
Clear.
Tue
104° 72°
Clear.
Wed
101° 69°
Clear.
Thu
99° 72°
Clear.
Fri
100° 72°
Clear.
Sat
101° 72°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 100° Clear 3% 10 mph S 29%
4 PM 100° Clear 3% 11 mph S 29%
5 PM 101° Clear 3% 11 mph S 30%
6 PM 98° Mostly Clear 3% 10 mph S 32%
7 PM 95° Mostly Clear 3% 8 mph S 37%
8 PM 91° Mostly Clear 3% 8 mph SSE 41%
9 PM 88° Mostly Clear 3% 9 mph SSE 46%
10 PM 86° Partly Cloudy 3% 9 mph SSE 50%
11 PM 85° Partly Cloudy 3% 10 mph SSE 55%
12 AM 83° Partly Cloudy 3% 10 mph SSE 60%
1 AM 81° Mostly Clear 3% 9 mph S 65%
2 AM 80° Mostly Clear 3% 9 mph S 70%
3 AM 79° Mostly Clear 3% 8 mph S 75%
4 AM 78° Mostly Clear 3% 8 mph S 78%
5 AM 73° Mostly Clear 3% 8 mph SSW 81%
6 AM 72° Mostly Clear 3% 8 mph SSW 84%
7 AM 74° Mostly Clear 3% 8 mph SSW 79%
8 AM 77° Clear 3% 9 mph SSW 69%
9 AM 81° Clear 3% 10 mph SSW 62%
10 AM 86° Clear 3% 10 mph SSW 57%
11 AM 88° Clear 3% 10 mph SSW 52%
12 PM 90° Clear 3% 11 mph SSW 48%
1 PM 94° Clear 3% 11 mph SSW 46%
2 PM 95° Clear 3% 11 mph S 46%
15-Day Forecast
Today
9/13
Clear
3%
72°
101°
Mon
9/14
Clear
3%
72°
103°
Tue
9/15
Clear
3%
72°
104°
Wed
9/16
Clear
8%
69°
101°
Thu
9/17
Clear
9%
72°
99°
Fri
9/18
Clear
18%
72°
100°
Sat
9/19
Clear
19%
72°
101°
Sun
9/20
Clear
60%
71°
94°
Mon
9/21
Drizzle
60%
60°
92°
Tue
9/22
Drizzle
60%
58°
90°
Wed
9/23
Drizzle
60%
61°
90°
Thu
9/24
Clear
60%
68°
90°
Fri
9/25
Clear
25%
67°
90°
Sat
9/26
Drizzle
60%
67°
90°
Sun
9/27
Clear
60%
67°
90°
38
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
33 AQI 6.0 µg/m³
O3
Ground-level ozone
Dominant
38 AQI 41 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 38 Good 38 33
Tue 36 Good 36 31
Wed 35 Good 35 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
SBCAPE859 J/kg
MLCAPE93 J/kg
MUCAPE859 J/kg
SBCIN-10 J/kg
MLCIN-144 J/kg
Lifted Index-3.1
Kinematics
0–6 km Shear17 kt
0–1 km Shear2 kt
Eff. Shear18 kt
0–1 km SRH-4
0–3 km SRH29
Eff. SRH29
Storm Motion83° @ 14 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.3
Thermo & Levels
PWAT1.62 in
0–3 km LR8.9 °C/km
700–500 LR6.1 °C/km
Total Totals45.7
LCL738 hPa
LFC685 hPa
EL191 hPa
Freezing Lvl15,781 ft