As of 6:58 PM PDT on September 2, 2025, 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 Friday Harbor, WA with a reading of 0.6.
Over the next 24 hours, the highest UV Index reading in San Juan County, WA is expected to be 5.2 in Friday Harbor between 1:00 PM - 2:00 PM PDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |