Grayson County, TX: Current UV Index and Hourly Forecast

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As of 10:42 AM CDT on April 29, 2026, all 18 cities in Grayson County, TX in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Sherman, TX with a reading of 3.7.

Over the next 24 hours, the highest UV Index reading in Grayson County, TX is expected to be 7.5 in Van Alstyne between 3:00 PM - 4:00 PM CDT today.

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Current UV Index in Cities in Grayson County, TX

• Bells - 3.7
• Collinsville - 3.5
• Denison - 3.7
• Dorchester - 3.7
• Gunter - 3.7
• Howe - 3.7
• Knollwood - 3.7
• Pottsboro - 3.7
• Preston - 3.7
• Sadler - 3.7
• Sherman - 3.7
• Sherwood Shores - 3.7
• Southmayd - 3.7
• Tioga - 3.5
• Tom Bean - 3.7
• Van Alstyne - 3.7
• Whitesboro - 3.7
• Whitewright - 3.7