UV Index in Kahoku, Japan

Last updated: June 2, 2025

In Kahoku, Japan, being aware of the UV Index is crucial for maintaining your skin health and preventing sunburn. Understanding UV levels helps residents and visitors alike to protect themselves during peak sunlight hours, especially when the index can soar to a high of 11 around noon. With a climate classified as Cfa, Kahoku experiences a humid subtropical environment, which can intensify UV exposure risks. By staying informed, you can enjoy the beautiful outdoor activities this vibrant area offers while safeguarding your skin from harmful ultraviolet rays.

Hourly UV Index in Kahoku

The UV Index peaks dramatically as the day unfolds, beginning at a mild 2 by 7:00 AM. As the sun climbs higher, the intensity builds steadily, reaching 4 by 8:00 AM and then soaring to 7 at 9:00 AM. The sun’s rays hit their zenith at 12:00 PM, with an intensity of 11, signaling the necessity for sun protection. With a slight dip, the index remains high at 10 by 1:00 PM, before gradually declining to 8 at 2:00 PM. The afternoon sees a gentle descent, with the index falling to 5 by 3:00 PM, then further to 3 at 4:00 PM. As evening approaches, the UV Index drops significantly, settling at a low of 1 by 6:00 PM and staying consistent through 7:00 PM. It’s a strong reminder to safeguard yourself during the midday hours when the sun is most potent!

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
15:005moderate30 min
16:003moderate30 min
17:002low45 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Kahoku

As the seasons change, so do UV levels, with significant increases during the warmer months. From March to August, the UV Index rises dramatically, peaking at 11 (extreme) in June, July, and August, where burn times are as short as 10 minutes. April and May also present high risk, with a UV Index of 10 (very high) and burn times of 15 minutes. Conversely, the risk decreases significantly in the cooler months, with a moderate exposure category during January, February, November, and December, allowing for 30 minutes of safe sun exposure. Visitors and residents should take extra precautions from March to September, using sunscreen, wearing protective clothing, and seeking shade, especially during peak hours, to minimize sun damage.

Monthly Maximum UV Index for Kahoku, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Kahoku. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec35710101111119643
Data source: Statistical UV Index data for Kahoku, 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 Kahoku UV Index with Other Japan Cities

The table above highlights how UV exposure in Kahoku 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.
Kahoku's solar exposure compared to other cities in Japan. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Sapporo UVI2367999108532
Kahoku35710101111119653
Yokohama UVI35891111111110754
Tokyo UVI35891111111110754
Nagoya UVI468101111111110753
Osaka UVI468111111121110753