Jefferson County, NY: Current UV Index and Hourly Forecast

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As of 12:01 PM EDT on July 22, 2026, out of 30 cities in Jefferson County, NY in our database, 26 cities (87%) have a UV Index reading of Moderate, while 4 cities (13%) have a UV Index reading of High. The city with the highest UV Index reading right now is Adams Center, NY with a reading of 5.7.

Over the next 24 hours, the highest UV Index reading in Jefferson County, NY is expected to be 6.8 in Chaumont between 2:00 PM - 3:00 PM EDT today.

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Current UV Index in Cities in Jefferson County, NY

• Adams Center - 5.7
• Alexandria Bay - 2.9
• Belleville - 5.7
• Black River - 4.7
• Calcium - 4.7
• Carthage - 4.3
• Chaumont - 4.2
• Deferiet - 4.7
• Depauville - 2.9
• Dexter - 3.8
• Evans Mills - 4.7
• Felts Mills - 4.7
• Fishers Landing - 2.9
• Fort Drum - 4.7
• Glen Park - 3.8
• Great Bend - 4.7
• Herrings - 4.7
• La Fargeville - 2.9
• Mannsville - 5.7
• Natural Bridge - 4.3
• Oxbow - 3.2
• Pamelia Center - 3.8
• Pierrepont Manor - 5.7
• Plessis - 3.2
• Redwood - 3.2
• Sackets Harbor - 3.8
• Thousand Island Park - 2.9
• Three Mile Bay - 4.2
• Watertown - 3.8
• West Carthage - 4.3