As of 5:59 PM EDT on August 18, 2026, all 33 cities in Warren County, NJ in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Johnsonburg, NJ with a reading of 2.1.
Over the next 24 hours, the highest UV Index reading in Warren County, NJ is expected to be 8.3 in Finesville 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 |