As of 4:07 PM CDT on May 20, 2026, out of 17 cities in Franklin County, MO in our database, 9 cities (53%) have a UV Index reading of Low, while 8 cities (47%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is St. Clair, MO with a reading of 3.9.
Over the next 24 hours, the highest UV Index reading in Franklin County, MO is expected to be 8.3 in New Haven 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 |