As of 12:47 PM EDT on September 16, 2025, all 10 cities in Howard County, MD in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Columbia, MD with a reading of 2.2.
Over the next 24 hours, the highest UV Index reading in Howard County, MD is expected to be 3.5 in Columbia between 3:00 PM - 4:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |