As of 9:26 AM EST on December 15, 2025, all 19 cities in Union County, NJ in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Plainfield, NJ with a reading of 0.6.
Over the next 24 hours, the highest UV Index reading in Union County, NJ is expected to be 1.7 in Elizabeth between 12:00 PM - 1:00 PM EST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |