As of 1:54 PM EDT on August 3, 2026, out of 11 cities in St. Lawrence County, NY in our database, 7 cities (64%) have a UV Index reading of Low, while 4 cities (36%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Heuvelton, NY with a reading of 5.3.
Over the next 24 hours, the highest UV Index reading in St. Lawrence County, NY is expected to be 7.7 in Cranberry Lake between 12:00 PM - 1:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |