As of 3:06 AM EDT on August 19, 2025, all 11 cities in St. Clair County, MI 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 St. Clair County, MI is expected to be 4.2 in St. Clair between 11:00 AM - 12:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |