Last updated: August 1, 2025
In Hinokage, Japan, being aware of the UV Index is crucial for safeguarding your skin against harmful ultraviolet radiation. Understanding UV levels can significantly aid in sunburn prevention and maintaining overall skin health, particularly in a region where the climate falls within the Cfa zone, characterized by warm summers and humid conditions. With UV Index levels peaking at 12 around noon, residents and visitors alike should remain vigilant during peak hours to mitigate risks associated with overexposure. Staying informed about these daily fluctuations empowers everyone to enjoy the outdoors while keeping their skin protected from potential damage.
The UV Index for the day reveals a dynamic shift in sun exposure, peaking dramatically between 11:00 AM and 1:00 PM. Starting the morning with a mild maximum of 2 at 7:00 AM, the index steadily rises, reaching 12 by midday—an indication of high risk for harm from unprotected sun exposure. As the afternoon progresses, it dips to 10 at 2:00 PM and then gradually decreases to a more moderate level of 4 by 4:00 PM. By the evening, the UV Index settles back down to 1 by 6:00 PM, signaling a safe time to enjoy the outdoors again. Be sure to protect your skin during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, with the most dangerous months being April through September, where the index consistently reaches extreme levels of 11 to 12. March marks the transition to very high exposure, with a UV Index of 9, while February shows an increase to 6, categorized as high. During the peak summer months from May to August, burn times drop dramatically to just 10 minutes, underscoring the urgency for protective measures. Conversely, the UV Index decreases to moderate levels of 4 in January and December, allowing for longer safe exposure times of up to 30 minutes. To ensure safety, visitors and residents should prioritize sun protection strategies—such as sunscreen, protective clothing, and seeking shade—especially during high-risk months of April through September.
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 |
| 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 |
| Hinokage | 4 | 6 | 9 | 11 | 12 | 12 | 12 | 12 | 11 | 8 | 6 | 4 |