As of 3:30 PM MST on December 21, 2025, all 7 cities in Stillwater County, MT in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Rapelje, MT with a reading of 0.2.
Over the next 24 hours, the highest UV Index reading in Stillwater County, MT is expected to be 1.1 in Rapelje between 12:00 PM - 1:00 PM MST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |