As of 8:11 AM PDT on July 19, 2025, all 2 cities in Columbia County, WA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Dayton, WA with a reading of 1.5.
Over the next 24 hours, the highest UV Index reading in Columbia County, WA is expected to be 8.1 in Dayton between 12:00 PM - 1:00 PM PDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |