As of 3:28 PM EDT on June 23, 2025, out of 19 cities in Union County, NJ in our database, 18 cities (95%) have a UV Index reading of High, while 1 city (5%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Plainfield, NJ with a reading of 7.6.
Over the next 24 hours, the highest UV Index reading in Union County, NJ is expected to be 10.1 in New Providence 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 |