As of 4:46 AM MST on January 22, 2026, all 8 cities in Dewey County, SD in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in Dewey County, SD is expected to be 1.4 in North Eagle Butte between 12:00 PM - 1:00 PM MST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |