As of 12:48 PM MDT on September 28, 2026, out of 495 cities in Montana in our database, 484 cities (98%) have a UV Index reading of Moderate, while 11 cities (2%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Biddle, MT with a reading of 4.5.
Over the next 24 hours, the highest UV Index reading in Montana is expected to be 5.1 in West Yellowstone 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 |