As of 6:08 AM CST on December 21, 2024, all 18 cities in Williamson County, TX in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in Williamson County, TX is expected to be 3.4 in Round Rock between 1:00 PM - 2:00 PM CST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |