As of 9:26 AM EDT on September 2, 2026, all 10 cities in Union County, PA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Lewisburg, PA with a reading of 1.2.
Over the next 24 hours, the highest UV Index reading in Union County, PA is expected to be 4.9 in Hartleton between 3:00 PM - 4:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |