UV Index in Unnan, Japan

Last updated: June 2, 2025

Understanding the UV Index is vital for residents of Unnan, Japan, as it plays a crucial role in protecting skin health and preventing sunburn. With the humid subtropical climate (Cfa) prevalent in this region, UV levels can soar, especially during midday hours. The data reveals peak UV intensity reaching an alarming 11 around noon, underlining the necessity for vigilance. By staying informed about these UV levels, you can take proactive measures to safeguard your skin while enjoying the beautiful outdoors that Unnan has to offer.

Hourly UV Index in Unnan

The UV Index begins its climb at 07:00 with a mild 2, gradually escalating to a peak of 11 at 12:00. As the sun reaches its zenith, so does the intensity of ultraviolet rays, making this the most critical time for sun safety. From 13:00, the index gradually descends, dropping to 6 by 15:00, then tapering off further to 4 at 16:00. As evening approaches, the UV levels decrease significantly, settling at 2 by 17:00, and then dwindling to a minimal 1 after 18:00. To sum up, it's crucial to take protective measures during the midday hours when the UV Index peaks, ensuring you're shielded from harmful rays.

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

Monthly UV Index Trends in Unnan

Throughout the year, the UV Index experiences notable fluctuations, with significant increases during the spring and summer months. March marks the beginning of high-risk UV exposure, peaking in July and August at a severe UV Index of 12, where the recommended burn time is just 10 minutes. Both April and May maintain an extreme category, urging outdoor enthusiasts to exercise caution. From September onward, UV levels gradually decline, but the risk remains high into early fall. Residents and visitors are advised to protect themselves, especially during the high-risk months of March to September, by applying sunscreen, wearing protective clothing, and seeking shade to minimize sun exposure. As the year progresses, understanding and adapting to these changes can help ensure safety and enjoyment in outdoor activities.

Monthly Maximum UV Index for Unnan, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Unnan. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec458111111121110753
Data source: Statistical UV Index data for Unnan, 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 Unnan UV Index with Other Japan Cities

The table above highlights how UV exposure in Unnan 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.
Unnan'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
Unnan458111111121210753
Osaka UVI468111111121110753