As of 7:27 PM EDT on July 23, 2026, all 26 cities in New Castle County, DE in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Wilmington, DE with a reading of 0.4.
Over the next 24 hours, the highest UV Index reading in New Castle County, DE is expected to be 9.4 in Delaware City between 1:00 PM - 2:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |