As of 4:02 PM MDT on May 20, 2026, out of 14 cities in Pennington County, SD in our database, 8 cities (57%) have a UV Index reading of Moderate, while 6 cities (43%) have a UV Index reading of Low. The city with the highest UV Index reading right now is New Underwood, SD with a reading of 3.6.
Over the next 24 hours, the highest UV Index reading in Pennington County, SD is expected to be 7 in Rapid City between 1:00 PM - 2:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |