National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rainfall in the Mid-Atlantic and Southern New England; Fire Weather Concerns in the West

Heavy rain and isolated severe thunderstorms may continue to bring flash and urban flooding to the northern Mid-Atlantic and southern New England through tonight. Isolated dry thunderstorms will continue to bring a fire weather threat to the northwestern Great Basin through Friday. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Overcast

75°F

24°C

Humidity 86%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 1 Aug 6:15 am CDT
Extended Forecast for

Grayson County Airport TX

  • Today

    Today: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 98. North northeast wind 5 to 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Northeast wind around 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 87. East wind around 5 mph. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 90. East southeast wind around 5 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 69. East wind around 5 mph.

    Low: 69 °F

    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89. East wind around 5 mph.

    High: 89 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 69. East southeast wind around 5 mph.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. East southeast wind around 5 mph.

    High: 94 °F

    Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 98. North northeast wind 5 to 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Northeast wind around 5 mph.
Saturday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 87. East wind around 5 mph. Chance of precipitation is 30%.
Saturday Night
Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 90. East southeast wind around 5 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 69. East wind around 5 mph.
Monday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89. East wind around 5 mph.
Monday Night
Mostly clear, with a low around 69. East southeast wind around 5 mph.
Tuesday
Sunny, with a high near 94. East southeast wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
Sunny, with a high near 98.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.68°W (Elev. 751 ft)
Last Update:
5:24 am CDT Aug 1, 2025
Forecast Valid:
7am CDT Aug 1, 2025-6pm CDT Aug 7, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation