UV Index in Nanyo, Japan

Last updated: May 3, 2025

In Nanyo, Japan, staying informed about the UV Index is crucial for safeguarding your skin against harmful ultraviolet radiation. Understanding UV levels not only helps in preventing painful sunburns but also promotes long-term skin health by reducing the risk of skin cancer. With a Dfb climate, Nanyo experiences significant UV exposure, especially from late morning to early afternoon, when UV Index levels can reach as high as 10. Being aware of these risks empowers residents and visitors to take appropriate precautions, ensuring a safer and healthier outdoor experience.

Hourly UV Index in Nanyo

The UV Index for today peaks dramatically as the sun rises, beginning at a modest 2 at 07:00. The intensity quickly escalates, reaching 4 by 08:00 and soaring to 7 by 09:00. By 10:00, the index hits 9, and it reaches its zenith at 11:00 and 12:00, both clocking in at an impressive 10—indicating a high risk of harm from unprotected sun exposure. As the afternoon progresses, the index gradually declines, dipping to 9 at 13:00, then sliding to 7 at 14:00. By 15:00, it reduces to 4, and as the day winds down, the index falls to 2 at 16:00, and further to 1 by 17:00 and 18:00, before settling at a safe 0 by 19:00. Remember, it’s crucial to protect your skin during the peak hours when the UV Index 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	2	low	45 min
08:00	4	moderate	30 min
09:00	7	high	25 min
10:00	9	very high	15 min
11:00	10	very high	15 min
12:00	10	very high	15 min
13:00	9	very high	15 min
14:00	7	high	25 min
15:00	4	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Nanyo

Throughout the year, UV levels demonstrate significant seasonal variations, with high-risk months typically occurring from March through August. During this period, the UV Index peaks at 11 in June, July, and August, marking it as an extreme risk category with a burn time of just 10 minutes. In contrast, the lowest UV Index readings, categorized as moderate, occur in January, February, November, and December, allowing for 30-minute exposure without immediate risk of skin damage. Visitors and residents should prioritize sun safety measures, particularly in the high-risk months—using sunscreen, wearing protective clothing, and seeking shade during peak hours to minimize potential harm from intense UV radiation.

Monthly Maximum UV Index for Nanyo, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Nanyo. 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 Nanyo, 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 Nanyo UV Index with Other Japan Cities

The table above highlights how UV exposure in Nanyo 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.

Nanyo'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
Nanyo	3	5	8	9	10	11	11	11	9	7	5	3
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