As of 3:42 PM EDT on August 23, 2026, out of 11 cities in St. Lawrence County, NY in our database, 10 cities (91%) have a UV Index reading of Moderate, while 1 city (9%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Ogdensburg, NY with a reading of 4.7.
Over the next 24 hours, the highest UV Index reading in St. Lawrence County, NY is expected to be 6.2 in Heuvelton between 1:00 PM - 2:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |