As of 10:07 AM CDT on September 9, 2026, all 15 cities in Fond du Lac County, WI in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is St. Peter, WI with a reading of 1.
Over the next 24 hours, the highest UV Index reading in Fond du Lac County, WI is expected to be 5.7 in Van Dyne between 2:00 PM - 3:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |