UV Index by State 2025

The UV index, a measure of the strength of ultraviolet (UV) radiation from the sun, varies across states in the United States, presenting different levels of sun exposure risks to residents. States like Arizona and Florida consistently experience high UV indexes, reaching levels of 10, indicating very high UV exposure, particularly during peak daylight hours. Conversely, states like Alaska and Hawaii show extreme differences, with Alaska displaying a UV index of 1 and Hawaii soaring to an index of 11, reflecting the unique geographic locations and atmospheric conditions of each state.

Understanding the UV index is crucial for sun safety, as prolonged exposure to high levels of UV radiation can increase the risk of skin cancer, premature aging, and other health issues. The Centers for Disease Control and Prevention (CDC) and the Environmental Protection Agency (EPA) provide resources and guidelines for individuals to monitor UV indexes and take appropriate precautions to protect their skin when spending time outdoors. By staying informed and practicing sun-safe behaviors such as wearing sunscreen, protective clothing, and seeking shade, individuals can reduce their risk of sun-related health problems and enjoy the outdoors safely.