Jefferson County, NY: Current UV Index and Hourly Forecast

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As of 7:00 AM EDT on March 21, 2026, all 30 cities in Jefferson County, NY 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 Jefferson County, NY is expected to be 4.2 in Alexandria Bay between 1:00 PM - 2:00 PM EDT today.

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Current UV Index in Cities in Jefferson County, NY

• Adams Center - 0
• Alexandria Bay - 0
• Belleville - 0
• Black River - 0
• Calcium - 0
• Carthage - 0
• Chaumont - 0
• Deferiet - 0
• Depauville - 0
• Dexter - 0
• Evans Mills - 0
• Felts Mills - 0
• Fishers Landing - 0
• Fort Drum - 0
• Glen Park - 0
• Great Bend - 0
• Herrings - 0
• La Fargeville - 0
• Mannsville - 0
• Natural Bridge - 0
• Oxbow - 0
• Pamelia Center - 0
• Pierrepont Manor - 0
• Plessis - 0
• Redwood - 0
• Sackets Harbor - 0
• Thousand Island Park - 0
• Three Mile Bay - 0
• Watertown - 0
• West Carthage - 0