UV index in Phoenix
The UV index measures the sun's ultraviolet strength on a 0-11+ scale. Protection is recommended once it reaches 3 — in much of the US that is most midday hours from spring through early fall.
☀️ Right now
036811+
Guidance:
No protection needed for most people.
UV across the country today
The strongest sun among the cities we track today is over Miami, FL, where the index peaks near 11. 4 of the 10 cities reach 8 or higher — very high, which means unprotected skin can burn in under 20 minutes around midday. The index tracks the sun's angle, not the heat: it peaks within an hour of solar noon, runs higher at altitude and roughly doubles off snow or water.