As of 1:58 PM EDT on August 18, 2026, all 3 cities in Rockingham County, NH in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Portsmouth, NH with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in Rockingham County, NH is expected to be 7.3 in Portsmouth between 12:00 PM - 1:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |