As of 1:27 PM CDT on August 30, 2025, all 14 cities in St. Croix County, WI in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Somerset, WI with a reading of 6.3.
Over the next 24 hours, the highest UV Index reading in St. Croix County, WI is expected to be 6.4 in Somerset between 2:00 PM - 3:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |