As of 1:52 PM MST on November 10, 2025, all 4 cities in Costilla County, CO in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is San Luis, CO with a reading of 3.6.
Over the next 24 hours, the highest UV Index reading in Costilla County, CO is expected to be 3.6 in San Luis between 1:00 PM - 2:00 PM MST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |