Last updated: August 1, 2025
In Kurihara, Japan, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. With a climate characterized as Cfa, residents and visitors are often exposed to varying levels of ultraviolet radiation throughout the year. Understanding these UV levels is essential, especially when peak indices can reach a staggering 11 around noon, indicating a severe risk of harm from unprotected sun exposure. By staying informed about the UV Index, you can take proactive measures to protect your skin and enjoy all that Kurihara has to offer while minimizing health risks.
As the sun rises, the UV Index begins to climb, starting at a moderate 3 by 7:00 AM. By 8:00 AM, it's already reached 5, signaling the onset of a more intense UV exposure. The peak arrives around noon, where it skyrockets to an intense 11, highlighting the importance of sun protection during these hours. After this zenith, the index gradually declines, dipping to 9 by 1:00 PM and returning to a more manageable 5 by 3:00 PM. As the afternoon progresses, the UV intensity fades significantly, settling at 3 by 4:00 PM and dwindling further to 1 by 5:00 PM. Lastly, by the time dusk arrives at 7:00 PM, the UV Index drops to 0, wrapping up the day’s sun exposure. Stay vigilant and protect your skin during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
As the year progresses, the UV Index in our region exhibits significant fluctuations, reflecting seasonal changes that are essential for visitors and residents to note. During the winter months of January and February, the UV Index remains in the moderate range (3-4), allowing for a burn time of about 30 minutes. However, as spring approaches, particularly in March, the UV Index rises sharply to high (7), reducing burn time to 25 minutes. The months of April through August present the highest risk, with UV Index values reaching very high (8-9) in April and May, escalating to a peak of extreme (11) in July and August, where the burn time drops to just 10 minutes. By September, there’s a slight decline to very high (9), and it further reduces in the fall months, with the index returning to the moderate range by November and December. Residents and visitors should take care during high-risk months—particularly from March through September—by seeking shade, wearing protective clothing, and using sunscreen to safeguard against harmful UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sapporo UVI | 2 | 3 | 6 | 7 | 9 | 9 | 9 | 10 | 8 | 5 | 3 | 2 |
| Kurihara | 3 | 4 | 7 | 8 | 9 | 10 | 11 | 11 | 9 | 6 | 4 | 3 |
| Yokohama UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Tokyo UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Nagoya UVI | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |