As of 9:08 AM MDT on August 21, 2026, all 8 cities in Ada County, ID in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Boise, ID with a reading of 1.
Over the next 24 hours, the highest UV Index reading in Ada County, ID is expected to be 7.9 in Garden City between 2:00 PM - 3:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |