As of 12:18 PM MDT on September 16, 2025, 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 High. The city with the highest UV Index reading right now is Rapid City, SD with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in Pennington County, SD is expected to be 5.9 in Box Elder between 1:00 PM - 2:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |