As of 11:04 AM PDT on September 3, 2026, out of 28 cities in San Joaquin County, CA in our database, 19 cities (68%) have a UV Index reading of Moderate, while 9 cities (32%) have a UV Index reading of High. The city with the highest UV Index reading right now is Escalon, CA with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in San Joaquin County, CA is expected to be 7.9 in Manteca 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 |