Nimbocast

Denison, TX Weather

Live radar, hourly and 7-day forecast, and National Weather Service alerts for Denison, Grayson County, Texas.

Updated Jul 29, 2026, 2:16 PM local time · Radar refreshes every 5 minutes

☀️
Denison
Clear
100°F
Feels like 104°F
Wind 11 mph
Humidity 30%
Cloud cover 5%
UV index 8
Alerts 1

Active alerts (1)

Heat AdvisoryModerate
Montague; Cooke; Grayson; Fannin; Lamar; Young; Jack; Wise; Denton; Collin; Hunt; Delta; Hopkins; Parker; Tarrant; Dallas; Rockwall; Kaufman; Van Zandt; Rains; Johnson; Ellis; Henderson; Hill; Navarro
Until Jul 30, 2026, 6:00 AM
Full details
* WHAT...Heat index values between 105 and 108 degrees.

* WHERE...Portions of North and Central Texas.

* WHEN...Until 8 PM CDT Thursday.

* IMPACTS...Hot temperatures and high humidity will increase the
risk for heat-related illnesses to occur, particularly for
those working or participating in outdoor activities.

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Denison weather radar

Light Heavy

Next 24 hours

Now
☀️
100°F
1%
3 PM
☀️
101°F
1%
4 PM
☀️
101°F
1%
5 PM
☀️
101°F
1%
6 PM
☀️
100°F
1%
7 PM
☀️
98°F
1%
8 PM
☀️
96°F
1%
9 PM
☀️
93°F
1%
10 PM
☀️
90°F
1%
11 PM
☀️
89°F
1%
12 AM
☀️
87°F
1%
1 AM
🌤️
86°F
1%
2 AM
☀️
85°F
1%
3 AM
☀️
84°F
1%
4 AM
☀️
84°F
2%
5 AM
☀️
83°F
3%
6 AM
☀️
81°F
4%
7 AM
82°F
4%
8 AM
🌤️
85°F
4%
9 AM
🌤️
88°F
4%
10 AM
🌤️
91°F
4%
11 AM
☀️
95°F
4%
12 PM
☀️
98°F
3%
1 PM
🌤️
100°F
3%

7-day forecast

Today
Jul 29
101°F
80°F
1%
Thu
Jul 30
103°F
81°F
4%
Fri
Jul 31
🌦️
106°F
84°F
8%
Sat
Aug 1
🌦️
95°F
77°F
8%
Sun
Aug 2
☁️
95°F
67°F
1%
Mon
Aug 3
☀️
98°F
69°F
2%
Tue
Aug 4
☀️
104°F
71°F
5%

Weather near Denison

9 mi Sherman, TX19 mi Durant, OK33 mi Celina, TX35 mi Gainesville, TX39 mi McKinney, TX39 mi Prosper, TX45 mi Frisco, TX45 mi The Trails of Frisco, TX
Alerts are relayed from the National Weather Service and may lag the official source. In a life-threatening situation always follow weather.gov and local emergency broadcasts.