UV Index Today in Phoenix, Arizona

Current UV
Today's Max

Hourly UV Forecast

low moderate high very high extreme

Surface Type

Reflective surfaces increase your UV exposure — snow reflects up to 90%, sand about 20%.

Safe Exposure Time

Estimated burn times based on the Fitzpatrick scale for skin color and today's maximum UV index of . Tap your skin type:

Very fair skin, always burns, never tans

Time until burn
With SPF 15*
With SPF 30*

*Assumes proper application of broad-spectrum sunscreen with reapplication every 2 hours. Estimates follow WHO guidance and satellite-derived data — see how our data works.

Sun Times

Dawn
Sunrise
Solar Noon
Sunset
Dusk
Day Length
Morning Golden Hour Ends
Evening Golden Hour

Important Safety Information

General Guidelines

These exposure times are estimates based on scientific research and should be used as general guidelines only. Individual responses to UV exposure may vary.

Affecting Factors

UV exposure is affected by: time of day, season, altitude, cloud cover, reflection from surfaces, and individual skin sensitivity.

Protection Tips

Seek shade during peak UV hours (10 AM - 4 PM), wear protective clothing, use broad-spectrum sunscreen, and monitor the UV index regularly.

Medical Advice

Consult a healthcare provider for personalized sun protection advice, especially if you have a history of skin conditions or take medications that increase sun sensitivity.

Phoenix's UV Climate

Phoenix, located in the Sonoran Desert of central Arizona, experiences an extremely arid climate with some of the highest UV exposure levels in the United States. The city's desert location, high elevation, and clear skies result in intense UV radiation throughout most of the year. The combination of extremely hot temperatures, minimal cloud cover, and outdoor activities makes comprehensive sun protection critical for residents and visitors, particularly during the scorching summer months.

Average Annual UV Index

9.1

Peak UV Season

April - September

Sunny Days per Year

330

Typical UV Index by Season in Phoenix

Season Typical Midday UV Protection Needed
Summer Very High to Extreme (10-11+) SPF 30+, hat, sunglasses; shade from 10 AM – 4 PM
Spring & Fall High to Very High (7-10) SPF 30+ for extended time outdoors
Winter Moderate (3-5) Sunscreen for long midday exposure; more on snow

UV Index in Nearby Cities

Practical Tips for Outdoor Activities

Make the most of outdoor activities while staying safe in Maricopa County:

UV and Weather in Maricopa County

Learn about Maricopa County's unique climate patterns, UV radiation levels, and how they affect your daily life. Enter your zip code for location-specific weather radar data and UV forecasts to help you make informed decisions about outdoor activities and sun protection.

Climate and UV Patterns

Phoenix's desert climate creates extreme UV exposure conditions with very high to extreme UV levels for most of the year. The city receives intense UV radiation due to its high elevation, clear skies, and southern latitude, with UV index values frequently reaching 11+ during peak hours. Local weather radar shows minimal cloud cover throughout the year, meaning residents face maximum UV exposure. The arid conditions can also create a false sense of comfort, as UV rays are most intense in dry, clear conditions.

UV Index and Health Impact

Understanding UV radiation levels is crucial for protecting your health. Typical clear-day UV index values in Phoenix through the year:

  • Summer: Very High to Extreme (10-11+)
  • Spring/Fall: High to Very High (7-10)
  • Winter: Moderate (3-5)
  • Peak UV hours: 10 AM - 4 PM
  • Cloud cover can reduce UV by 20-40%, but does not eliminate it
  • Clear skies bring maximum UV exposure

Local Weather Patterns

Phoenix's weather patterns create unique UV exposure challenges throughout the year. The city experiences extremely hot summers with clear skies and minimal precipitation, resulting in maximum UV exposure. During the monsoon season (July to September), afternoon thunderstorms can temporarily reduce UV levels, but morning and early afternoon hours still present extreme exposure risk. The city's high elevation and desert location mean UV radiation is more intense than at sea level. Winter months bring cooler temperatures but still feature high UV levels due to clear skies and southern latitude.

Frequently Asked Questions About UV in Phoenix

What is the UV index in Phoenix today?

The live UV index for Phoenix, AZ is shown at the top of this page and updates throughout the day, along with today's maximum and an hourly forecast.

When is the sun strongest in Phoenix?

UV radiation is strongest between 10 AM and 4 PM. Phoenix's peak UV season runs April - September, when the midday index typically reaches Very High to Extreme (10-11+).

How high does the UV index get in Phoenix?

Summer days in Phoenix typically reach Very High to Extreme (10-11+). Spring and fall usually bring High to Very High (7-10), while winter values are typically Moderate (3-5).

Do I need sunscreen in Phoenix during winter?

It is a good idea. Winter UV in Phoenix still reaches moderate levels on clear days, so sunscreen is recommended for extended time outdoors.

How sunny is Phoenix compared to other cities?

Phoenix averages about 330 sunny days per year with an average annual UV index around 9.1.