As of 12:03 PM CDT on April 20, 2026, out of 7 cities in Lyman County, SD in our database, 4 cities (57%) have a UV Index reading of Moderate, while 3 cities (43%) have a UV Index reading of High. The city with the highest UV Index reading right now is Oacoma, SD with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in Lyman County, SD is expected to be 6.5 in Vivian 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 |