As of 12:26 PM CDT on September 5, 2026, out of 4 cities in Washington County, MO in our database, 2 cities (50%) have a UV Index reading of Low, while 2 cities (50%) have a UV Index reading of High. The city with the highest UV Index reading right now is Irondale, MO with a reading of 5.5.
Over the next 24 hours, the highest UV Index reading in Washington County, MO is expected to be 6.2 in Potosi 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 |