As of 2:05 PM CDT on May 4, 2026, all 12 cities in Harrison County, IA in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Missouri Valley, IA with a reading of 6.5.
Over the next 24 hours, the highest UV Index reading in Harrison County, IA is expected to be 6.5 in Missouri Valley 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 |