UV Index in Rusutsu, Japan

Last updated: May 3, 2025

Being aware of the UV Index in Rusutsu, Japan is crucial for residents and visitors alike, especially given the area's unique Dfb climate. Understanding UV levels can help you protect your skin by preventing sunburn and long-term health issues related to UV exposure. During peak hours, particularly from 11:00 AM to 1:00 PM, the UV Index can soar to 9, indicating a high risk of harm from unprotected sun exposure. Whether you're enjoying outdoor adventures in this picturesque region or simply soaking in the natural beauty, knowing the UV levels can empower you to take necessary precautions and maintain your skin health all year round.

Hourly UV Index in Rusutsu

As the sun rises, the UV Index begins its ascent, peaking at 11:00 AM and 12:00 PM with a blistering 9. The day starts gently, with 07:00 AM registering a modest 2, but by 09:00 AM, it climbs to a moderate 6. The intensity escalates, hitting 8 at 10:00 AM and reaching its zenith shortly after noon. After this peak, the index gradually dips, easing down to 6 by 2:00 PM, before falling further to 4 at 3:00 PM. As evening approaches, the UV radiation wanes significantly, dropping to 2 by 4:00 PM and near zero after sunset, signaling a shift in the skies. Remember to protect your skin during those peak 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
09:006high25 min
10:008very high15 min
11:009very high15 min
12:009very high15 min
13:008very high15 min
14:006high25 min
15:004moderate30 min
16:002low45 min
17:001low45 min
18:001low45 min
19:000low45 min

Monthly UV Index Trends in Rusutsu

Throughout the year, the UV Index experiences significant fluctuations, reflecting shifts in seasonal sun exposure. January and December see low UV levels (Index 2), with burn times of 45 minutes, indicating minimal risk. As spring approaches, February (Index 3) and March (Index 6) signal moderate to high exposure risk, shortening burn times to 30 and 25 minutes respectively. The risk escalates dramatically in May through August, where UV Index values peak at 10, categorizing the exposure as very high, and reducing safe burn time to just 15 minutes. September remains high at 8, marking it as a continuation of the peak summer risk, after which the index drops to 6 in October and returns to moderate in November. For both residents and visitors, it is crucial to take precautions during the high-risk months of March to September, utilizing sunscreen, wearing protective clothing, and seeking shade, especially when the UV Index is significant.

Monthly Maximum UV Index for Rusutsu, Japan

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Rusutsu. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec236791010108632
Data source: Statistical UV Index data for Rusutsu, 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 Rusutsu UV Index with Other Japan Cities

The table above highlights how UV exposure in Rusutsu 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.
Rusutsu's solar exposure compared to other cities in Japan. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Sapporo UVI2367999108532
Rusutsu236791010108632
Yokohama UVI35891111111110754
Tokyo UVI35891111111110754
Nagoya UVI468101111111110753
Osaka UVI468111111121110753