How strong is UV in the United States in 2026?

The EPA publishes daily UV Index forecasts for US locations. Phoenix and Las Vegas combine desert sun with long cloud-free spells inside desert Southwest climate. Miami and Tampa run strong UV across most of the year within Florida climate. Los Angeles adds bright coastal light even when summer heat stays milder than inland valleys.

Denver and Colorado ski towns add altitude: thinner air means stronger UV per minute on slopes and patios. Pair mountain weekends with snow in the United States planning, because snow reflection increases exposure. Seattle and Portland run lower winter UV, yet clear summer middays still warrant protection during outdoor recreation.

Cloud cover and breeze trick people into skipping sunscreen on beach culture days. Driving with an arm on the window and patio lunches create incidental burns. Wildfire smoke can lower UV somewhat while still leaving harmful levels; never treat smoke haze as sun protection: Wildfire smoke.

Housing with shade, awnings, and morning versus afternoon balcony use matters in Phoenix and Miami lease decisions. School sport and outdoor work often assume hat and sunscreen norms locals treat as routine, not tourist theatre.