UV Index in Nanjo, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Nanjo, Japan, where the sun’s rays can be particularly intense. Awareness of UV levels helps in preventing harmful sunburns and maintaining long-term skin health, especially during peak times when the UV Index rises to 13 in midday hours. Nanjo, characterized by its Cfa climate, experiences substantial sunlight exposure, making it essential to stay informed about daily UV forecasts. By staying vigilant, you can enjoy the beautiful outdoors while protecting yourself from the potential risks associated with high UV radiation.

Hourly UV Index in Nanjo

The UV Index peaks dramatically throughout the day, starting from a gentle 1 at 07:00 and gradually rising to an impressive 13 by 12:00. This midday surge marks the day’s highest UV exposure, with levels reaching 11 at 11:00 and 13:00. As the sun begins to descend, the index declines smoothly, tapering back to 8 at 15:00, then 5 at 16:00, and finally settling down to 1 by 18:00 and 19:00. It's essential to stay protected, especially during those peak hours, as the sun’s rays can be quite fierce!

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
11:0011extreme10 min
12:0013extreme10 min
13:0013extreme10 min
14:0011extreme10 min
15:008very high15 min
16:005moderate30 min
17:002low45 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Nanjo

Throughout the year, the UV Index exhibits significant fluctuations, with the highest levels occurring during the late spring and summer months. From February to September, the index reaches extreme highs, particularly in March to August, where the UV Index consistently sits at 13 with a minimal burn time of 10 minutes. The high-risk months are clearly identified as March through September, when individuals should take extra precautions. In contrast, January and December see lower UV levels, categorized as high with a burn time of 25 minutes, while October and November experience very high levels (UV Index 9) but allow slightly longer exposure (15 minutes). To ensure safety, residents and visitors are strongly advised to wear protective clothing, apply sunscreen frequently, and seek shade during peak sun hours in the high-risk months.

Monthly Maximum UV Index for Nanjo, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Nanjo. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec7911121313131312996
Data source: Statistical UV Index data for Nanjo, 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 Nanjo UV Index with Other Japan Cities

The table above highlights how UV exposure in Nanjo 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.
Nanjo's solar exposure compared to other cities in Japan. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Sapporo UVI2367999108532
Yokohama UVI35891111111110754
Tokyo UVI35891111111110754
Nagoya UVI468101111111110753
Osaka UVI468111111121110753
Nanjo7911121313131312996