As of 12:26 PM EDT on July 23, 2026, all 1 cities in Grand Isle County, VT in our database have a UV Index reading of High. The city with the highest UV Index reading right now is South Hero, VT with a reading of 6.6.
Over the next 24 hours, the highest UV Index reading in Grand Isle County, VT is expected to be 6.6 in South Hero between 12:00 PM - 1:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |