As of 12:11 PM PDT on May 22, 2026, out of 5 cities in Sherman County, OR in our database, 4 cities (80%) have a UV Index reading of High, while 1 city (20%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Grass Valley, OR with a reading of 7.5.
Over the next 24 hours, the highest UV Index reading in Sherman County, OR is expected to be 8 in Grass Valley between 1:00 PM - 2:00 PM PDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |