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

Excessive Rainfall Possible This Weekend; October Heat Wave in California

A slow moving front will be the focus area for heavy to excessive rainfall and a threat for flash/urban flooding across the northern Gulf Coast and Southeast U.S. through this weekend. Abnormally hot, potentially record-breaking, temperatures will impact southern California and stretch north toward the Bay Area and Central Valley into next week. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Grayson County Airport TX

  • This Afternoon

    This Afternoon: A 30 percent chance of showers. Cloudy, with a high near 75. Northeast wind around 5 mph.

    High: 75 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 65. North northeast wind around 5 mph.

    Low: 65 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers before 7am. Partly sunny, with a high near 82. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Chance
    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. North northeast wind 5 to 10 mph.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83. Northeast wind around 5 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 58. North northeast wind around 5 mph becoming calm.

    Low: 58 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 83. East northeast wind around 5 mph becoming calm.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 58. Calm wind.

    Low: 58 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83. Calm wind becoming east around 5 mph.

    High: 83 °F

    Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers. Cloudy, with a high near 75. Northeast wind around 5 mph.
Tonight
A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 65. North northeast wind around 5 mph.
Sunday
A 30 percent chance of showers before 7am. Partly sunny, with a high near 82. North northeast wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 62. North northeast wind 5 to 10 mph.
Monday
Sunny, with a high near 83. Northeast wind around 5 mph.
Monday Night
Clear, with a low around 58. North northeast wind around 5 mph becoming calm.
Tuesday
Sunny, with a high near 83. East northeast wind around 5 mph becoming calm.
Tuesday Night
Clear, with a low around 58. Calm wind.
Wednesday
Sunny, with a high near 83. Calm wind becoming east around 5 mph.
Wednesday Night
Clear, with a low around 59.
Thursday
Sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 62.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.68°W (Elev. 751 ft)
Last Update:
5:06 pm CDT Oct 3, 2026
Forecast Valid:
5pm CDT Oct 3, 2026-6pm CDT Oct 10, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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