As of 4:27 PM MDT on August 31, 2025, out of 495 cities in Montana in our database, 473 cities (96%) have a UV Index reading of Moderate, while 22 cities (4%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Jackson, MT with a reading of 4.6.
Over the next 24 hours, the highest UV Index reading in Montana is expected to be 7.4 in West Yellowstone 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 |