Grayson County, TX: Current UV Index and Hourly Forecast

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As of 8:16 PM CDT on May 19, 2026, all 18 cities in Grayson County, TX in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in Grayson County, TX is expected to be 9 in Van Alstyne between 2:00 PM - 3:00 PM CDT tomorrow.

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Current UV Index in Cities in Grayson County, TX

• Bells - 0
• Collinsville - 0
• Denison - 0
• Dorchester - 0
• Gunter - 0
• Howe - 0
• Knollwood - 0
• Pottsboro - 0
• Preston - 0
• Sadler - 0
• Sherman - 0
• Sherwood Shores - 0
• Southmayd - 0
• Tioga - 0
• Tom Bean - 0
• Van Alstyne - 0
• Whitesboro - 0
• Whitewright - 0