As of 11:54 AM EST on December 19, 2025, all 6 cities in Merrimack County, NH in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Concord, NH with a reading of 0.1.
Over the next 24 hours, the highest UV Index reading in Merrimack County, NH is expected to be 0.8 in Concord between 10:00 AM - 11:00 AM EST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |