As of 9:47 PM PDT on September 21, 2026, all 62 cities in King County, WA in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in King County, WA is expected to be 3.9 in Maple Valley between 2:00 PM - 3:00 PM PDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |