Jefferson County, NY: Current UV Index and Hourly Forecast

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As of 3:58 PM EDT on May 22, 2026, all 30 cities in Jefferson County, NY in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Fort Drum, NY with a reading of 6.1.

Over the next 24 hours, the highest UV Index reading in Jefferson County, NY is expected to be 6.1 in Fort Drum between 3:00 PM - 4:00 PM EDT today.

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Current UV Index in Cities in Jefferson County, NY

• Adams Center - 5.5
• Alexandria Bay - 6.1
• Belleville - 5.5
• Black River - 6.1
• Calcium - 6.1
• Carthage - 5.9
• Chaumont - 6
• Deferiet - 6.1
• Depauville - 6.1
• Dexter - 6
• Evans Mills - 6.1
• Felts Mills - 6.1
• Fishers Landing - 6.1
• Fort Drum - 6.1
• Glen Park - 6
• Great Bend - 6.1
• Herrings - 6.1
• La Fargeville - 6.1
• Mannsville - 5.5
• Natural Bridge - 5.9
• Oxbow - 5.9
• Pamelia Center - 6
• Pierrepont Manor - 5.5
• Plessis - 5.9
• Redwood - 5.9
• Sackets Harbor - 6
• Thousand Island Park - 6.1
• Three Mile Bay - 6
• Watertown - 6
• West Carthage - 5.9