UV Index in Tempe, United States

Last updated: July 2, 2025

Understanding the UV Index in Tempe, United States, is crucial for everyone to enjoy the sunny days while protecting their skin. With the city’s BWh climate bringing plenty of sunshine year-round, awareness of UV levels can help prevent sunburn and promote long-term skin health. During peak hours, from 10 AM to 2 PM, the UV Index often reaches dangerous levels, peaking at 11, which can significantly increase the risk of skin damage. Stay informed and take the necessary precautions to safeguard your skin from Tempe’s intense sun exposure!

Hourly UV Index in Tempe

The UV Index throughout the day showcases a dramatic rise and fall that is vital for sun safety. Starting at 07:00, it begins with a low reading of 1, but by 08:00, it climbs to 3. The intensity peaks between 11:00 and 13:00, soaring to an impressive 11, indicating a significant risk for harm without sun protection. As the afternoon progresses, the index starts to decline, dipping to 10 at 14:00, then falling further to 7 by 15:00. As evening approaches, the UV Index drops quickly, reaching a low of 1 by 18:00 and remaining there until 19:00. To enjoy the outdoors safely, be sure to slather on the sunscreen during that midday surge!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:003moderate30 min
09:005moderate30 min
10:008very high15 min
11:0010very high15 min
12:0011extreme10 min
13:0011extreme10 min
14:0010very high15 min
15:007high25 min
16:005moderate30 min
17:003moderate30 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Tempe

Throughout the year, the UV Index demonstrates notable seasonal changes, with the highest risk months occurring from March to September. During this period, UV Index values peak at 11 (extreme) in May, June, July, and August, resulting in a significantly reduced burn time of just 10 minutes for unprotected skin. Conversely, the lower risk months are from November to February, where the index ranges from 4 to 6 (moderate to high) and burn times increase to 25-30 minutes. Visitors and residents should exercise caution during the peak summer months by applying sunscreen, wearing protective clothing, and seeking shade, especially between the hours of 10 AM and 4 PM when UV exposure is at its highest.

Monthly Maximum UV Index for Tempe, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Tempe. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110754
Data source: Statistical UV Index data for Tempe, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare Tempe UV Index with Other United States Cities

The table above highlights how UV exposure in Tempe compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Tempe's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Los Angeles UVI46891011111010754
Tempe469101112111110754
Houston UVI589111112121110975