When does Phoenix need sun protection?

Whenever the UV index is 3 or above. In Phoenix that is typically from April through October, and any other day UV reaches 3. The EPA Sun Safety action steps apply at the same threshold used worldwide.

Does Phoenix need sun protection in winter?

Not every day. Midwinter middays in Phoenix often sit below UV 3, but clear late-winter and early-spring days cross the threshold before summer fully arrives. Check the live index.

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 sits under some of the strongest routine UV in the continental United States: clear desert air, low latitude and long cloudless summers. Heat and UV move together here, but even a mild winter lunch outside can burn fast.

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 nearly every day in Phoenix. Winter middays still commonly reach UV 3 or higher.

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.

Where the UV adds up in Phoenix

Long, happy hours outdoors are where exposure quietly accumulates. Local favourites where the five S’s earn their keep:

Camelback Mountain
South Mountain Park
Tempe Town Lake
Desert Botanical Garden

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 typically from April through October, and any other day UV reaches 3. The EPA Sun Safety action steps apply at the same threshold used worldwide.
Does Phoenix need sun protection in winter?: Not every day. Midwinter middays in Phoenix often sit below UV 3, but clear late-winter and early-spring days cross the threshold before summer fully arrives. Check the live index.
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.