As of 1:08 PM EDT on September 13, 2026, out of 14 cities in Shiawassee County, MI in our database, 10 cities (71%) have a UV Index reading of Moderate, while 4 cities (29%) have a UV Index reading of High. The city with the highest UV Index reading right now is Byron, MI with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in Shiawassee County, MI is expected to be 5.6 in Byron between 1:00 PM - 2:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |