As of 3:27 PM CDT on May 20, 2026, out of 7 cities in St. Clair County, MO in our database, 5 cities (71%) have a UV Index reading of Low, while 2 cities (29%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Appleton City, MO with a reading of 4.8.
Over the next 24 hours, the highest UV Index reading in St. Clair County, MO is expected to be 4.8 in Appleton City between 3:00 PM - 4:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |