Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

83°F

28°C

Humidity 72%
Wind Speed SE 8 mph
Barometer 30.07 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 16 Aug 1:35 am CDT
Extended Forecast for

4 Miles NE Willis OK

Heat Advisory August 16, 12:00pm until August 16, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Overnight

    Overnight: Partly cloudy, with a low around 77. South wind around 6 mph.

    Low: 77 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Heat index values as high as 104. South wind 5 to 10 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 77. South southeast wind 5 to 9 mph becoming light south  after midnight.

    Low: 77 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 3 to 7 mph.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 77. South southeast wind around 6 mph becoming calm  in the evening.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 99.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 98.

    High: 98 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 77. South wind around 6 mph.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 104. South wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 77. South southeast wind 5 to 9 mph becoming light south after midnight.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 3 to 7 mph.
Sunday Night
Partly cloudy, with a low around 77. South southeast wind around 6 mph becoming calm in the evening.
Monday
Sunny and hot, with a high near 99.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Chance of precipitation is 50%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 71.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NE Willis OK
 33.93°N 96.77°W
12:45 am CDT Aug 16, 2025
1am CDT Aug 16, 2025-6pm CDT Aug 22, 2025
 
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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