As of 3:07 PM PDT on June 10, 2026, all 16 cities in Lassen County, CA in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Janesville, CA with a reading of 8.
Over the next 24 hours, the highest UV Index reading in Lassen County, CA is expected to be 10.7 in Janesville 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 |