As of 10:16 AM CDT on August 19, 2026, out of 9 cities in Boone County, IA in our database, 8 cities (89%) have a UV Index reading of Moderate, while 1 city (11%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Madrid, IA with a reading of 3.1.
Over the next 24 hours, the highest UV Index reading in Boone County, IA is expected to be 6.6 in Madrid between 1:00 PM - 2:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |