As of 2:46 PM CDT on March 20, 2026, all 13 cities in Hays County, TX in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is San Marcos, TX with a reading of 8.3.
Over the next 24 hours, the highest UV Index reading in Hays County, TX is expected to be 8.3 in San Marcos 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 |