As of 11:39 AM EDT on April 5, 2026, out of 17 cities in Mercer County, NJ in our database, 13 cities (76%) have a UV Index reading of Low, while 4 cities (24%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Twin Rivers, NJ with a reading of 2.8.
Over the next 24 hours, the highest UV Index reading in Mercer County, NJ is expected to be 3 in Trenton between 10:00 AM - 11:00 AM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |