As of 3:29 PM CDT on June 3, 2026, all 4 cities in Washington County, MO in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Irondale, MO with a reading of 7.4.
Over the next 24 hours, the highest UV Index reading in Washington County, MO is expected to be 8.4 in Potosi 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 |