Last updated: August 1, 2025
Understanding the UV Index in Komatsushimacho, Japan is crucial for anyone who spends time outdoors, especially as the region experiences a humid subtropical climate (Cfa). With UV levels peaking at 12 between noon and 1 PM, awareness of these figures can help prevent sunburn and protect skin health throughout the year. Knowing when the UV radiation is most intense allows residents and visitors to make informed decisions about sun safety measures, minimizing the risks associated with prolonged exposure. Stay informed and enjoy the beautiful outdoors of Komatsushimacho while keeping your skin safe!
The UV Index throughout the day exhibits a dramatic rise, peaking at 12 around noon. Starting from a humble 2 at 7:00 AM, the intensity steadily climbs as the sun ascends. By 10:00 AM, it reaches 9, signaling that sun protection is essential. The zenith occurs at 11:00 AM with a staggering 11, followed closely by 12 at noon, making it crucial to seek shade and wear sunscreen. The index begins to taper off in the afternoon, descending to 6 by 3:00 PM, and then falls further to 1 as evening sets in. This trend underscores the importance of monitoring UV levels to ensure safe sun exposure at its peak.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | 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 | 6 | high | 25 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV exposure levels vary significantly, with the highest risks typically occurring in the late spring to summer months. From April through August, the UV Index reaches extreme levels of 11 to 12, indicating that even short exposure (as little as 10 minutes) can result in skin damage. The highest-risk months are April, May, June, July, and August, where it's crucial for both visitors and residents to take protective measures such as wearing sunscreen, hats, and protective clothing. As summer transitions to fall, UV levels begin to decline, with an Index of 10 in September, followed by 7 in October and 6 in November. Visitors and residents should remain vigilant, especially during these peak months, to ensure their safety and well-being under the sun. In the winter months (December and January), the UV Index drops to 4, indicating a moderate risk, allowing for longer burn times of 30 minutes.
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 |
| Komatsushimacho | 4 | 6 | 8 | 11 | 11 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |