As of 10:21 AM EDT on September 21, 2025, all 11 cities in St. Joseph County, IN in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Osceola, IN with a reading of 1.2.
Over the next 24 hours, the highest UV Index reading in St. Joseph County, IN is expected to be 5.5 in Lakeville between 2:00 PM - 3:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |