As of 10:03 AM PST on December 13, 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 0.4.
Over the next 24 hours, the highest UV Index reading in San Juan County, WA is expected to be 0.7 in Friday Harbor between 12:00 PM - 1:00 PM PST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |