As of 4:00 PM CDT on August 8, 2025, all 9 cities in Winneshiek County, IA in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Castalia, IA with a reading of 3.7.
Over the next 24 hours, the highest UV Index reading in Winneshiek County, IA is expected to be 5.5 in Decorah 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 |