UV Index in China, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in both China and the United States, as it serves as a vital tool for sunburn prevention and maintaining overall skin health. With China experiencing a diverse climate that features significant UV exposure, especially during peak hours, being aware of the UV levels can help you take necessary precautions. Notably, UV Index readings can soar to 11 by mid-afternoon, indicating extreme conditions that can pose serious risks to skin health. By staying informed about the UV Index, you can enjoy the outdoors while taking the essential steps to protect your skin from harmful ultraviolet rays.

Hourly UV Index in China

The UV Index throughout the day reveals a striking pattern of solar intensity. Starting off low at 1 during the early hours of 07:00 and 08:00, the index takes a notable leap as the sun rises higher in the sky. By 09:00, it reaches 3, but the real surge hits at 10:00, soaring to 6. The peak occurs at 12:00, where it tops out at a blistering 11, followed closely by 12:00 with a maximum of 12, indicating an urgent need for sun protection. As the afternoon progresses, the index gradually declines but remains significant, hovering around 10 at 15:00 and sliding to 7 by 16:00. By 17:00, it drops to 4 and continues to fade into the evening hours, settling back at 1 by 19:00. This data underscores the importance of sun safety during peak hours, especially between 10:00 and 14:00 when UV exposure is at its highest.

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
08:001low45 min
09:003moderate30 min
10:006high25 min
11:009very high15 min
12:0011extreme10 min
13:0012extreme10 min
14:0011extreme10 min
15:0010very high15 min
16:007high25 min
17:004moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in China

As the seasons change, so do the UV Index levels, significantly affecting the risk of skin damage from sun exposure. January and December have a moderate UV Index of 5, allowing for a burn time of 30 minutes. However, by February, the UV levels escalate to 8, marking the beginning of very high exposure with a reduced burn time of 15 minutes. The risk peaks in the summer months, particularly April through August, where the UV Index reaches a maximum of 12, classified as extreme, necessitating protective measures within just 10 minutes. September and October see a slight decline to very high levels of 10 and 9, respectively, while November cools to a high risk of 7 with a burn time of 25 minutes. Visitors and residents are advised to take precautions during the high-risk months of February to August, utilizing sunscreen, protective clothing, and seeking shade, particularly during peak sun hours, to minimize sun damage and maintain skin health.

Monthly Maximum UV Index for China, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in China. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec589111212121110975
Data source: Statistical UV Index data for China, 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 China UV Index with Other United States Cities

The table above highlights how UV exposure in China 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.
China'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
China589111112121110975
Houston UVI589111112121110975