As of 10:36 AM MDT on May 15, 2026, all 2 cities in Powder River County, MT in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Biddle, MT with a reading of 4.3.
Over the next 24 hours, the highest UV Index reading in Powder River County, MT is expected to be 8 in Biddle between 1:00 PM - 2:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |