As of 1:40 PM CDT on April 19, 2026, all 15 cities in Columbia County, WI in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Columbus, WI with a reading of 4.7.
Over the next 24 hours, the highest UV Index reading in Columbia County, WI is expected to be 5.9 in Lake Wisconsin 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 |