As of 12:14 PM PST on January 18, 2026, out of 52 cities in San Bernardino County, CA in our database, 51 cities (98%) have a UV Index reading of Moderate, while 1 city (2%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Yucca Valley, CA with a reading of 3.4.
Over the next 24 hours, the highest UV Index reading in San Bernardino County, CA is expected to be 3.5 in Big Bear City between 11:00 AM - 12:00 PM PST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |