As of 3:39 AM EST on March 4, 2026, all 1 cities in Grand Isle County, VT 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 Grand Isle County, VT is expected to be 3.3 in South Hero between 11:00 AM - 12:00 PM EST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |