UV Index
UV Index
Today's UV index in Aspen, United States 
will be up to 12, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-09
UV index at 12 in Aspen means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
Aspen has a UV index that varies throughout the year, often reaching moderate to high levels in summer months, typically ranging from 4 to 8. In winter, the UV index tends to be lower, usually between 1 and 3.
Aspen's weather shows clear seasonal patterns: cold, snowy winters ideal for skiing and mild, pleasant summers. Spring and autumn bring transitional weather with some rain and cooler temperatures, with spring sometimes experiencing late snowfalls.
Compared to the broader Rocky Mountain region, Aspen tends to have more snowfall and cooler winter temperatures due to its elevation. It is generally colder and snowier than nearby lower-elevation areas but has similar seasonal changes to other mountain towns in Colorado and neighboring states like Utah and Wyoming.
See the UV index hour by hour for Aspen, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.