As of 11:28 AM CST on December 18, 2025, all 10 cities in Decatur County, IA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Lamoni, IA with a reading of 1.2.
Over the next 24 hours, the highest UV Index reading in Decatur County, IA is expected to be 1.5 in Lamoni between 12:00 PM - 1:00 PM CST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |