As of 4:55 PM PDT on June 21, 2026, all 27 cities in Washington County, OR in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Gaston, OR with a reading of 5.1.
Over the next 24 hours, the highest UV Index reading in Washington County, OR is expected to be 8.4 in Gaston 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 |