As of 1:04 PM CDT on August 13, 2026, all 1 cities in St. Louis City, MO in our database have a UV Index reading of High. The city with the highest UV Index reading right now is St. Louis, MO with a reading of 7.3.
Over the next 24 hours, the highest UV Index reading in St. Louis City, MO is expected to be 7.8 in St. Louis between 12:00 PM - 1:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |