Jefferson County, NY: Current UV Index and Hourly Forecast

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As of 2:58 PM EDT on September 1, 2026, out of 30 cities in Jefferson County, NY in our database, 16 cities (53%) have a UV Index reading of Low, while 14 cities (47%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Alexandria Bay, NY with a reading of 4.5.

Over the next 24 hours, the highest UV Index reading in Jefferson County, NY is expected to be 6.5 in Adams Center between 1:00 PM - 2:00 PM EDT tomorrow.

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Current UV Index in Cities in Jefferson County, NY

• Adams Center - 4.3
• Alexandria Bay - 4.5
• Belleville - 4.3
• Black River - 1.7
• Calcium - 1.7
• Carthage - 1.7
• Chaumont - 4
• Deferiet - 1.7
• Depauville - 4.5
• Dexter - 2.3
• Evans Mills - 1.7
• Felts Mills - 1.7
• Fishers Landing - 4.5
• Fort Drum - 1.7
• Glen Park - 2.3
• Great Bend - 1.7
• Herrings - 1.7
• La Fargeville - 4.5
• Mannsville - 4.3
• Natural Bridge - 1.7
• Oxbow - 2.6
• Pamelia Center - 2.3
• Pierrepont Manor - 4.3
• Plessis - 2.6
• Redwood - 2.6
• Sackets Harbor - 2.3
• Thousand Island Park - 4.5
• Three Mile Bay - 4
• Watertown - 2.3
• West Carthage - 1.7