UV Index in Nanao, Japan

Last updated: June 2, 2025

Understanding the UV Index in Nanao, Japan, is essential for maintaining optimal skin health and preventing sunburn during outdoor activities. With Nanao’s Cfa climate, residents and visitors are often exposed to varying levels of UV radiation throughout the day, peaking around midday with an impressive index of 11. Recognizing these levels empowers you to take necessary precautions, safeguarding your skin against potential damage and ensuring enjoyable, sun-safe experiences. Be mindful of the UV Index to effectively plan your activities, particularly when levels soar, and protect your skin from the sun's harmful effects!

Hourly UV Index in Nanao

As the sun rises, the UV Index begins its ascent, starting at a gentle 2 at 07:00. By 08:00, it climbs to 4, indicating a slight increase in UV exposure. The intensity peaks at 12:00, reaching a striking 11, suggesting that midday is the most hazardous time for unprotected skin. Afterward, the index gradually declines, dipping to 6 by 15:00 and falling further to 1 by 19:00, when the sun begins its descent. This hourly data underscores the importance of sun protection, especially during the critical hours from 10:00 to 14:00 when the UV levels are at their highest. Stay safe and make the most of the sunny hours!

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
07:002low45 min
08:004moderate30 min
09:007high25 min
10:009very high15 min
11:0010very high15 min
12:0011extreme10 min
13:0010very high15 min
14:008very high15 min
15:006high25 min
16:003moderate30 min
17:002low45 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Nanao

The UV Index experiences significant seasonal changes, with high-risk months occurring from March to September. During this period, the UV Index escalates from moderate levels of 3 in January and February to extreme levels of 11 in June, July, and August. The burn time dramatically decreases, from 30 minutes in January and February to just 10 minutes in the peak summer months. Visitors and residents are strongly advised to take proper precautions during the high-risk months by applying sunscreen, wearing protective clothing, and limiting sun exposure, especially between 10 AM and 4 PM when UV radiation is at its peak. After September, the UV Index begins to decline, but vigilance is still recommended through October.

Monthly Maximum UV Index for Nanao, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Nanao. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec34710101111119643
Data source: Statistical UV Index data for Nanao, 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 Nanao UV Index with Other Japan Cities

The table above highlights how UV exposure in Nanao 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.
Nanao's solar exposure compared to other cities in Japan. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Sapporo UVI2367999108532
Nanao34710101111119753
Yokohama UVI35891111111110754
Tokyo UVI35891111111110754
Nagoya UVI468101111111110753
Osaka UVI468111111121110753