As of 3:08 PM CDT on July 15, 2025, out of 98 cities in St. Louis County, MO in our database, 48 cities (49%) have a UV Index reading of Moderate, 32 cities (33%) have a UV Index reading of Low, while 18 cities (18%) have a UV Index reading of High. The city with the highest UV Index reading right now is Oakville, MO with a reading of 6.5.
Over the next 24 hours, the highest UV Index reading in St. Louis County, MO is expected to be 10.1 in Chesterfield between 1:00 PM - 2:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |