As of 8:30 AM MDT on June 13, 2026, all 2 cities in Sweet Grass County, MT in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Big Timber, MT with a reading of 0.1.
Over the next 24 hours, the highest UV Index reading in Sweet Grass County, MT is expected to be 5.3 in Big Timber between 3:00 PM - 4:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |