As of 11:09 AM CST on December 29, 2025, out of 13 cities in Hays County, TX in our database, 8 cities (62%) have a UV Index reading of Low, while 5 cities (38%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is San Marcos, TX with a reading of 2.7.
Over the next 24 hours, the highest UV Index reading in Hays County, TX is expected to be 3.2 in San Marcos between 12:00 PM - 1:00 PM CST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |