Grayson County, TX: Current UV Index and Hourly Forecast

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As of 9:58 PM CST on November 18, 2025, 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 3.2 in Van Alstyne between 12:00 PM - 1:00 PM CST 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