As of 12:33 PM CDT on May 21, 2026, out of 25 cities in Jefferson County, MO in our database, 15 cities (60%) have a UV Index reading of Moderate, 8 cities (32%) have a UV Index reading of High, while 2 cities (8%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is LaBarque Creek, MO with a reading of 8.
Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 8 in LaBarque Creek between 12:00 PM - 1:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |