When does Phoenix need sun protection?

Whenever the UV index is 3 or above. In Phoenix that is most of the year, including many winter middays. The EPA Sun Safety action steps apply at the same threshold used worldwide.

Does Phoenix need sun protection in winter?

Usually yes. At 29.6°N, winter middays in Phoenix still commonly reach UV 3 or higher. Check today's live reading on this page before a long lunch outside.

Can you burn on a cool day in Phoenix?

Yes. UV is not heat. A cool, windy or lightly cloudy day in Phoenix can still sit at UV 3 or above, especially from spring through autumn. Temperature on this page is for context only; the UV number is what decides protection.

UV index in Phoenix today

Phoenix is an inland Louisiana suburb at 29.6°S. Typical summer peaks of 10–12 (very high to extreme) arrive whether the day feels scorching or merely mild. This is subtropical sun: protection weather for much of the year, with winter middays that still often reach 3 or more.

Live reading · data by Open-Meteo · reference monitoring by ARPANSA

Today and tomorrow in Phoenix

Peak UV, temperature and conditions for Phoenix. Tomorrow’s peak is the number to plan around if you’re heading out in the middle of the day.

Weather conditions right now

Cloud and rain cut heat more than they cut UV. A partly cloudy day in Phoenix can still sit at protection levels. Why you burn on cloudy days.

When Phoenix needs sun protection

Sun protection is needed in Phoenix most of the year, including many winter middays. Inland heat or a cool change does not change the UV index; go by the number, not how the day feels.

The threshold, per SunSmart and ARPANSA: whenever UV reaches 3 or above, Slip on covering clothing, Slop on SPF 50+ sunscreen, Slap on a hat, Seek shade and Slide on sunglasses. Read the full sun safety guide.

The UV scale at a glance

0–2Low
3–5Moderate
6–7High
8–10Very high
11+Extreme

Frequently asked questions

When does Phoenix need sun protection?: Whenever the UV index is 3 or above. In Phoenix that is most of the year, including many winter middays. The EPA Sun Safety action steps apply at the same threshold used worldwide.
Does Phoenix need sun protection in winter?: Usually yes. At 29.6°N, winter middays in Phoenix still commonly reach UV 3 or higher. Check today's live reading on this page before a long lunch outside.
Can you burn on a cool day in Phoenix?: Yes. UV is not heat. A cool, windy or lightly cloudy day in Phoenix can still sit at UV 3 or above, especially from spring through autumn. Temperature on this page is for context only; the UV number is what decides protection.