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

Flooding Risks from Tropical Moisture Across the Southeast and Southwest

Tropical moisture from Isaias and Rachel will impact portions of the Southeast and Southwest this weekend. Flash flooding, strong winds and even a threat for severe thunderstorms and tornadoes are possible. Meanwhile, strong winds and dry fuels are raising fire weather concerns across the central Great Basin and western High Plains. Across the northern Rockies, first winter storm of the season. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

67°F

19°C

Humidity 84%
Wind Speed S 8 mph
Barometer 30.00 in
Dewpoint 62°F (17°C)
Visibility 9.00 mi
Last update 11 Oct 4:35 am CDT
Extended Forecast for

Grayson County Airport TX

  • Today

    Today: Mostly sunny, with a high near 89. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: Clear, with a low around 69. South wind 10 to 15 mph.

    Low: 69 °F

    Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 88. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. South wind around 10 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 91 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74. South wind around 10 mph.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. South wind around 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. South southeast wind 5 to 10 mph.

    Low: 70 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. South southwest wind around 10 mph.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 89. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Clear, with a low around 69. South wind 10 to 15 mph.
Columbus Day
Sunny, with a high near 88. South wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 73. South wind around 10 mph.
Tuesday
Mostly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 74. South wind around 10 mph.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. South wind around 15 mph, with gusts as high as 20 mph.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. South southeast wind 5 to 10 mph.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. South southwest wind around 10 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 40%.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.66°W (Elev. 797 ft)
Last Update:
2:11 am CDT Oct 11, 2026
Forecast Valid:
4am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation