UV Index in China, Japan

Last updated: June 2, 2025

In China and Japan, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. With the region's Cfa climate, characterized by humid subtropical conditions, UV exposure can reach alarming levels, peaking at an intense 13 around midday. Understanding these UV levels is essential, as even brief exposure can cause skin damage, increasing the risk of long-term health issues. Being informed about daily UV fluctuations empowers residents and visitors alike to take proactive measures—protecting their skin while enjoying outdoor activities under the sun.

Hourly UV Index in China

As the sun rises on this radiant day, the UV Index begins its ascent, starting at a mild 1 at 07:00 and gradually climbing. By 09:00, it reaches 6, indicating it's time to take some precautions. The intensity peaks at 12:00 with a robust 13, making it essential to seek shade and wear protective gear. For the next hour, the UV Index holds steady at its maximum, but begins to dip as the afternoon progresses—dropping to 8 by 15:00 and further down to 1 by 19:00. This fluctuation highlights the importance of sun safety, especially during the midday hours 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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	3	moderate	30 min
09:00	6	high	25 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in China

Throughout the year, UV exposure varies significantly, with the highest risk months occurring from March to September, where the UV Index remains extreme at 11 to 13. Residents and visitors should be particularly vigilant during this period, as the burn time is reduced to just 10 minutes. February also presents a high risk, with an index of 8, while October and November maintain very high levels, advising burn times of 15 minutes. As UV levels fluctuate, individuals should take precautions, such as wearing protective clothing, applying sunscreen regularly, and seeking shade during peak sun hours, especially in the high-risk months of March through September. January and December offer some relief with a high UV Index but longer burn times of 25 minutes. Staying informed about these changes can help ensure safe and enjoyable outdoor activities year-round.

Monthly Maximum UV Index for China, Japan

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.

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 Japan Cities

The table above highlights how UV exposure in China compares to other major locations across Japan. 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 Japan. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sapporo UVI	2	3	6	7	9	9	9	10	8	5	3	2
Yokohama UVI	3	5	8	9	11	11	11	11	10	7	5	4
Tokyo UVI	3	5	8	9	11	11	11	11	10	7	5	4
Nagoya UVI	4	6	8	10	11	11	11	11	10	7	5	3
Osaka UVI	4	6	8	11	11	11	12	11	10	7	5	3
China	7	8	11	12	13	13	13	13	13	9	8	6