Last updated: May 3, 2025
Understanding the UV Index in Komae, Japan is essential for protecting your skin from harmful ultraviolet rays. As the local climate offers a mix of humid summers and mild winters, residents and visitors alike must remain vigilant about UV levels, particularly during peak hours when the index can soar to a staggering 11 around noon. By keeping an eye on these levels, you can prevent painful sunburns and promote long-term skin health, ensuring you enjoy the beautiful outdoors safely. With UV exposure risks fluctuating throughout the day, being informed can make all the difference in your sun safety routine.
As the sun rises, the UV Index begins its ascent, reaching a gentle 2 by 07:00. By 08:00, it climbs to a moderate 5, signaling the start of a day to be mindful of sun exposure. The intensity peaks at 11 from 11:00 to 12:00, marking the golden hours when protective measures are crucial. As the afternoon unfolds, the value dips to 9 at 13:00 and continues its descent to 7 by 14:00. By the late afternoon, the UV Index relaxes significantly, falling to 4 at 15:00 and tapering off to 2 by 16:00. As the sun sets, it becomes a safe 1 at 17:00, finally reaching a calm 0 after 19:00. This data highlights the importance of sun safety practices during peak hours, especially between 10:00 and 14:00.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
As the seasons change, the UV Index fluctuates significantly, influencing the risk of sun exposure throughout the year. January and February start with a moderate UV Index of 3 and 5, allowing for a burn time of 30 minutes. However, by March, the UV Index jumps to 8, which is categorized as very high, reducing safe exposure to just 15 minutes. The peak months for UV radiation are May through August, where the Index reaches an extreme level of 11, necessitating a mere 10 minutes of exposure before risking sunburn. September begins a gradual decline to a very high index of 10, while October and onward return to moderate levels. Visitors and residents should be particularly cautious from March to August—wearing protective clothing, applying sunscreen, and seeking shade to minimize UV damage during these high-risk months.
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 |
| Komae | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| 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 |