As of 1:10 PM MDT on September 21, 2025, all 2 cities in Slope County, ND in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Marmarth, ND with a reading of 5.3.
Over the next 24 hours, the highest UV Index reading in Slope County, ND is expected to be 5.3 in Marmarth 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 |