As of 5:50 PM EDT on September 19, 2025, all 1 cities in Grand Isle County, VT in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is South Hero, VT with a reading of 0.9.
Over the next 24 hours, the highest UV Index reading in Grand Isle County, VT is expected to be 5.3 in South Hero 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 |