As of 3:04 PM CDT on September 7, 2026, all 9 cities in Washington County, WI in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Hartford, WI with a reading of 4.9.
Over the next 24 hours, the highest UV Index reading in Washington County, WI is expected to be 6.7 in Hartford 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 |