As of 3:05 PM EDT on June 25, 2026, out of 11 cities in Johnston County, NC in our database, 7 cities (64%) have a UV Index reading of Very High, 2 cities (18%) have a UV Index reading of Moderate, while 2 cities (18%) have a UV Index reading of High. The city with the highest UV Index reading right now is Smithfield, NC with a reading of 7.5.
Over the next 24 hours, the highest UV Index reading in Johnston County, NC is expected to be 10.6 in Clayton 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 |