As of 12:35 PM EDT on June 19, 2026, out of 131 cities in Nassau County, NY in our database, 77 cities (59%) have a UV Index reading of Very High, while 54 cities (41%) have a UV Index reading of High. The city with the highest UV Index reading right now is Bayville, NY with a reading of 8.
Over the next 24 hours, the highest UV Index reading in Nassau County, NY is expected to be 9.4 in Valley Stream between 1:00 PM - 2:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |