As of 3:29 PM CDT on April 26, 2025, all 8 cities in Grant County, SD in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Marvin, SD with a reading of 3.9.
Over the next 24 hours, the highest UV Index reading in Grant County, SD is expected to be 6.4 in Revillo between 2:00 PM - 3:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |