As of 10:46 AM CDT on May 20, 2026, all 8 cities in Big Stone County, MN in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Ortonville, MN with a reading of 3.3.
Over the next 24 hours, the highest UV Index reading in Big Stone County, MN is expected to be 7.1 in Graceville 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 |