As of 1:24 PM PST on November 15, 2025, out of 11 cities in Sierra County, CA in our database, 9 cities (82%) have a UV Index reading of Moderate, while 2 cities (18%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Calpine, CA with a reading of 2.7.
Over the next 24 hours, the highest UV Index reading in Sierra County, CA is expected to be 2.7 in Calpine between 1:00 PM - 2:00 PM PST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |