As of 5:10 PM MDT on July 13, 2026, all 19 cities in Box Elder County, UT in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Portage, UT with a reading of 4.5.
Over the next 24 hours, the highest UV Index reading in Box Elder County, UT is expected to be 10.1 in Howell between 1:00 PM - 2:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |