As of 4:11 PM PST on February 13, 2026, all 2 cities in San Juan County, WA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Roche Harbor, WA with a reading of 0.1.
Over the next 24 hours, the highest UV Index reading in San Juan County, WA is expected to be 1.1 in Friday Harbor between 11:00 AM - 12:00 PM PST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |