As of 4:02 PM MDT on May 20, 2026, out of 13 cities in Sanders County, MT in our database, 8 cities (62%) have a UV Index reading of Moderate, while 5 cities (38%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Heron, MT with a reading of 4.1.
Over the next 24 hours, the highest UV Index reading in Sanders County, MT is expected to be 7.3 in Thompson Falls between 2:00 PM - 3:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |