As of 9:14 AM EST on January 23, 2026, all 12 cities in Jefferson County, PA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Summerville, PA with a reading of 0.5.
Over the next 24 hours, the highest UV Index reading in Jefferson County, PA is expected to be 2 in Summerville 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 |