As of 2:29 PM MDT on April 26, 2025, all 10 cities in Big Horn County, MT in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Fort Smith, MT with a reading of 6.7.
Over the next 24 hours, the highest UV Index reading in Big Horn County, MT is expected to be 7 in Muddy 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 |