As of 2:48 AM MST on December 17, 2025, all 1 cities in Petroleum County, MT 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 Petroleum County, MT is expected to be 0.5 in Winnett between 11:00 AM - 12:00 PM MST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |