As of 3:27 PM CDT on May 20, 2026, out of 37 cities in Harris County, TX in our database, 22 cities (59%) have a UV Index reading of Moderate, 14 cities (38%) have a UV Index reading of Low, while 1 city (3%) have a UV Index reading of High. The city with the highest UV Index reading right now is Katy, TX with a reading of 7.3.
Over the next 24 hours, the highest UV Index reading in Harris County, TX is expected to be 7.3 in Katy between 3:00 PM - 4:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |