Grayson County, TX: Current UV Index and Hourly Forecast

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As of 8:35 AM CDT on April 9, 2026, all 18 cities in Grayson County, TX in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Sherman, TX with a reading of 0.3.

Over the next 24 hours, the highest UV Index reading in Grayson County, TX is expected to be 8.2 in Van Alstyne between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in Grayson County, TX

• Bells - 0.3
• Collinsville - 0.3
• Denison - 0.3
• Dorchester - 0.3
• Gunter - 0.3
• Howe - 0.3
• Knollwood - 0.3
• Pottsboro - 0.3
• Preston - 0.3
• Sadler - 0.3
• Sherman - 0.3
• Sherwood Shores - 0.3
• Southmayd - 0.3
• Tioga - 0.3
• Tom Bean - 0.3
• Van Alstyne - 0.3
• Whitesboro - 0.3
• Whitewright - 0.3