As of 1:10 PM EDT on August 25, 2026, out of 19 cities in Union County, NJ in our database, 17 cities (89%) have a UV Index reading of High, while 2 cities (11%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Plainfield, NJ with a reading of 7.
Over the next 24 hours, the highest UV Index reading in Union County, NJ is expected to be 7.1 in Plainfield 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 |