As of 2:22 PM MDT on May 9, 2026, out of 18 cities in Gallatin County, MT in our database, 15 cities (83%) have a UV Index reading of High, while 3 cities (17%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Hebgen Lake Estates, MT with a reading of 7.7.
Over the next 24 hours, the highest UV Index reading in Gallatin County, MT is expected to be 8.6 in Hebgen Lake Estates 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 |