As of 1:15 PM EDT on April 20, 2026, all 11 cities in St. Mary's County, MD in our database have a UV Index reading of High. The city with the highest UV Index reading right now is St. George Island, MD with a reading of 6.5.
Over the next 24 hours, the highest UV Index reading in St. Mary's County, MD is expected to be 6.5 in St. George Island between 1:00 PM - 2:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |