As of 1:01 PM EDT on April 20, 2026, all 61 cities in Washington County, MD in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Mount Aetna, MD with a reading of 6.
Over the next 24 hours, the highest UV Index reading in Washington County, MD is expected to be 6 in Halfway between 12:00 PM - 1:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |